Showing posts with label Tools. Show all posts
Showing posts with label Tools. Show all posts

Halogen Oven

A halogen oven, halogen convection oven, or halogen cooking pot is a type of oven that utilizes a halogen lamp as its heating element. It is used primarily for cooking. Halogen ovens are often noted for being more energy-efficient than a conventional oven due to their use of a halogen lamp reducing the cooking time usually needed in a conventional oven.

DesignA basic halogen oven features a heating chamber consisting of a clear glass bowl with a removable glass lid to which the heating assembly is secured. Inside the heating chamber, multi-level metal racks are used to elevate the contents during the cooking process. Within the heating assembly are the circular halogen lamp, a fan, and the controls for the oven which frequently include an automatic shut-off timer and a temperature control interface. On a basic model, the heating assembly has a handle to allow users to safely lift the lid off the unit. More elaborate models have a hinged lid mounted on an adjustable rear support which can be raised to accommodate an extension ring. This raises the heating assembly to reduce the grilling effect as well as increasing the volume of the oven. Hinged models are safer and easier to use. A safety shut-off switch turns off the lamp when the lid is raised during operation. The glass bowl is positioned in a stand which raises the bowl off the table-top and decreases the transfer of heat to the surrounding surfaces. Handles are often incorporated into the stand to allow for users to move the unit, providing safety especially during or after operation.

Operation
The halogen lamp is turned on and off by a simple thermostat or electronic control and generates waves of infrared light to heat the air within the heating chamber. The fan then circulates this heated air throughout the chamber to evenly cook the contents of the bowl through convective heat transfer, or convection. Self-cleaning can be performed by adding some hot water and detergent to the empty bowl. The fan swirls the hot water and usually takes about ten minutes to remove any grease and some food deposits.

Efficiency
Reports often claim halogen ovens have shorter cooking times than conventional ovens, with one report stating a figure of up to 40% faster, but 20% faster on average. Another report claims a halogen oven cooks food up to 60% faster than a conventional oven. In terms of energy use, one source claims that a halogen oven uses about "half the electricity of a conventional oven and about the same as a microwave oven".

Easy-Bake Oven

In an effort to comply with the Energy Independence and Security Act of 2007, Hasbro redesigned its Easy-Bake Oven to utilize a halogen lamp for the oven's heating element in place of its less efficient conventional incandescent heating element.

Fufu Machine

Fufu is a popular staple food in West and Central Africa made out of cassava, plantains or yams. The fine dough-like paste in its final form is achieved only after meticulous pounding of the ingredients, for at least 30 minutes, done with the use of the traditional pestle and mortar. Most African families seek the help of male family members for the task of continuous pounding. Fine hand and eye coordination is also essential to reduce the risk of having one’s fingers pounded while kneading the dough in the pestle.

In recent years, easier ways of preparing Fufu have been sought. An electric pounding machine has also been created that grinds cassava, yam and plantains in 1 minute. In August 2004, a prototype was built, using oxidized aluminum and an electric mortar with the strength of one horse-power; this prototype did not become commercially available until it was enhanced and launched by a group of lecturers at the Mechanical Engineering Department of the Kwame Nkrumah University of Science and Technology (KNUST).


Professor Kwadeo Kesse, Dr Lawrence Ansong and the late R.E Doddoo, all lecturers of the Engineering Department at KNUST, were involved in the project. Recent developments have been made to the innovation: a solar module was introduced by the Kumasi Polytechnic (K-Poly). It was developed by its Electrical Engineering Department in collaboration with the Japan International Cooperation Agreement (JICA)

Flattop Grill

A flattop grill is a cooking appliance that resembles a griddle but performs differently because the heating element is circular rather than straight (side to side). This heating technology creates an extremely hot and even cooking surface, as heat spreads in a radial fashion over the surface. Flattop grills have been around for hundreds of years in various forms and evolved in a number of cultures.

 History

The first flattop grills originated in Mexico and Central America for cooking corn dough. These flatop grills were made of clay. With the arrival of Spaniards, the griddles were manufactured of metal materials. Spaniards adopted these grills with the name plancha, which means "metal plate". Food that is cooked a la plancha means “grilled on a metal plate”. For example, filetes à la plancha translates as “grilled beef fillets”.

Description

The flattop grill is a versatile platform for many cooking techniques such as sautéing, toasting, simmering, shallow frying, stir frying, pan frying, browning, blackening, grilling, baking, braising, and roasting, and can also be used for flambéing. In addition, pots and pans can be placed directly on the cook surface, giving more cooking flexibility. In most cases, the steel cooksurface seasons like cast iron cookware, providing a natural non-stick surface. Almost any type of food can be cooked on this type of appliance. In addition to standard barbecue fare like hamburgers, hot dogs and sausages, more delicate items can be cooked on a flattop grill. Omelettes, crepes, paninis, yakisoba noodles, fish tacos, quesadillas, grilled steak, flatbread, pizza, jerk chicken, crab cakes and sautéed vegetables are just a few examples of the wide range of foods that can be prepared on a flattop grill.

Flattop grills, as the name implies, is typically a flat piece of steel but some are slightly convex or crowned in the center which allows excess juices or grease to flow to the outside to be captured and disposed of. Many are powered by natural gas or propane, but there are electric models as well. In addition, there are models made for indoor or outdoor cooking that can be fixed (built-in) or portable (wheeled or free-standing).

Flattop grills can be contrasted with open-flame grills, which cook food over a grate with direct or indirect flame. Flattop grills avoid the problem of smaller or delicate food falling through the grate like open-flame grills. In addition, closed-flame flattop grills are more energy efficient because they capture the heat under the steel cook surface rather than letting it escape through the grates into the atmosphere. This design also requires less time to heat up and uses less fuel to cook a meal. Also, flattop grills release less smoke and particulates into the atmosphere because foods and juices are prevented from dropping directly onto burner elements, eliminating flare-ups and reducing smoke.

 Use

 A flattop grill and fireplace area atop the grill used to heat an above cooking area, at Le Feu restaurant in Lyon, France
Flattop grills are an equipment of choice for seafood restaurants because of temperature consistency, flexibility and capacity.

In Cuban cuisine, the famous Cuban sandwich (ham, roasted pork, Swiss cheese and pickles) is traditionally grilled à la plancha. In Chilean cuisine, restaurants grill beef à la plancha and have a long history of cooking seafood on flattop grills. Flattop grills also share some characteristics with Asian cooking, including teppanyaki and Mongolian barbecue. Flatbreads from India (dosa, Paratha, roti and chapati), the Middle East (pita), Africa (injera) and Jamaica (bammy) are traditionally cooked on flattop grills.

Front-of-house cooking

In restaurants, flattop grills are sometimes used for display, or “front-of-house” cooking, where diners can see, hear and smell the food being cooked in front of them. Unlike butane burners or induction hobs which require additional equipment, the flattop grill can be used as a standalone cooking platform. Display cooking is a notable trend in commercial foodservice, where open kitchens are becoming part of the dining experience, and watching a meal being prepared live-action has become entertainment.

French tops

 A French top stove is similar to a flattop grill, except that it is only used with pots and pans. A large flame underneath the metal plate serves as its heat source, and is directly covered by concentric metal rings. The French top's temperature is usually not changed by its user, instead the user moves his pot or pan to a side or edge of the hot plate for slower cooking.

Fire Pot

Fire pot is a container, usually earthenware, for carrying fire. Fire pots have been used since prehistoric times to transport fire from one place to another, for warmth while on the move, for cooking, in religious ceremonies and even as weapons of war.

Campfire
Fire pots were vital to the development of civilization. Once humans had learned to contain, control and sustain fires, they had an invaluable tool for cooking food that would have otherwise not been edible. Fire pots were also useful for sharpening spears, hollowing out canoes, baking pottery, and many other tasks, such as staying warm.

At first, humans relied on natural fires, caused by lightning strikes or other natural occurrences, to provide them with a flame to start their own fires. Since natural fires are not very common, humans learned how to make fires by igniting tinder from sparks caused by striking stones together, or by creating friction using a bow drill.

Given the time-consuming nature of early firestarting, humans eventually began to use earthenware vessels, or fire pots, in which slow-burning fires could by kept alight indefinitely by using small quantities of fuel. Nomadic people could carry these small fires with them, using them to start larger fires for their evening camps.

Archaeologists found that fire pots were being used 10,000, or more, years ago, according to finds during the 1936-37 dig in Fells Cave , of which is located in the valley of the Rio Chico, not far from the Strait of Magellan.

Semi-nomadic and sedentary people would have made or acquired more advanced types of fire pots, as opposed to the fully nomadic people who would have used more primitive types. Being more sedentary, people were able to more effectively work with clay, and would have kilns to bake the pottery in, instead of using the traditional fire-baking methods.

WarmthEdit
Portable fire pots have long been used as a source of warmth.

Kangdi
A Kangdi  is a traditional earthen fire pot from Kashmir, used to warm the hands or feet. In Kashmir, in winter, people usually wear a "Phiran" or long woolen gown over their normal dress. To keep the inside of the Phiran warm, they sometimes use a Manann, a fire-pot made of clay. But with no insulation on its clay handles, the Manann is inconvenient.

A Kangdi is an improved version of the Manann, a semi-spherical clay pot enclosed in willow rushes, with handles also made of willow rushes. The pot holds burning coals that stay warm throughout the day. Throughout Kashmir in winter, it is common to see people with one hand holding their Kangdi inside their Phiran, doing the daily chores with the other.

Cooking
The fire pot was probably invented long after people discovered the value of cooking over fire. Once fire-proof containers became available, such as iron pots, it was natural to design fire pots that both heated and supported the cooking vessel. Over time, these developed into stoves, used both for cooking and heating.

Adogan
An earthenware fire-pot or indigenous stove found in West Africa , notably in Ilora and Oyo, an Adogan has a flat bottom with a carinated wall and an out-turned rim with three decorated lugs to support the cooking pot. A U-shaped hole is cut in one side to allow air to enter, and through which fuel is inserted.

Chinese Hot pot
Hot pot or huoguo (Simplified Chinese: ) is a traditional Chinese social meal. The literal Chinese translation is fire pot, as huo means fire, while guo refers to pot. The Chinese hot pot consists of a simmering metal pot of stock at the center of the dining table. While the hot pot is kept simmering, thinly sliced ingredients are placed into the pot and are cooked at the table. This type of cuisine is also referred to as "steamboat". In Western cooking, the fondue is used in a similar way, although usually with different ingredients.

Warfare
Small earthen pots filled with combustibles were used as early thermal weapons during the classical and medieval periods. Containers made at first from clay, later from cast iron, known as 'carcasses', were launched by a siege engine, filled with pitch, Greek fire or other incendiary mixtures. These fire pots could cause great damage to besieged cities with largely wooden construction.

A description of how to make military fire pots is given in Lucar, 1588, cited by Martin 1994:207-217

"Make great and small earthen pottes which must be but half baked, and like unto the picture in the mergent . . . . Fill every of those pottes halfe with grosse gunpowder pressed downe harde, and with one of the five severall mixtures next following in this Chapter, fill up the other half of those pottes: This done, cover the mouth of every potte with a peece of canvasse bound hard about the mouth of the potte, and well imbrued in melted brimstone. Also tie round about the middle of every potte a packthreed, and then hang upon the same packthreed round about the potte so many Gunmatches of a finger length as you wil, & when you wil throe any of these pottes among enemies, light the same gun-matches that they may so soone as the potte is broken with his fall uppon the ground, fire the mixture of the potte. Or rather put fire to the mixture at the mouth of the potte, & by so doing make the same to burn before you doe throe the potte from you, because it is a better and more surer way than the other: I meane than to fire the said mixture after the potte is broken with burning gunmatches. Moreover this is to be noted, that the small pottes do serve for to be throne out of one shippe into an other in fight uppon the sea, and that the great pottes are to be used in service uppon the lande for the defence of townes, fortes, walles, and gates, and to burne such things as the enemies shall throe into ditches for to fill up the same ditches, and also to destroy enemies in their trenches and campes"

By the mid-17th century, fire pots had largely been replaced by shells filled with explosives, which may be seen as the direct descendants of military fire pots.

Religion and the ArtsEdit
There is an element of mystery in fire, which at times has led to fire worship. Fire pots have been used in religious ceremonies for thousands of years .[5] It would be inappropriate, and probably impossible, to cover all religious uses of fire pots in this article, but a few examples are relevant.

Censers
A Censer is any type of vessel made for burning incense. They range from simple earthenware bowls to intricately carved silver or gold vessels, small table top objects a few centimetres tall to as many as several metres high. In many cultures, burning incense has spiritual and religious connotations, and this influences the design and decoration of the censer.

Before a Buddhist tantric ritual, an assisting monk may swing a censer or thurible as he passes to 'purify' the room. This is a container usually made of metal that hangs form three chains. Inside it, powdered incense that has been put on a smoldering bit of charcoal burns slowly, and the smoke escapes through pierced openings in the closed lid. One tradition says that during one of the Buddha's sermons a monk heedlessly swatted a mosquito. The Tathagatha is said to have ordered that, in the future, incense ought to be lit in order to keep the flies away, so that people could more easily concentrate on Dharma teachings, but also to prevent the needless taking of lives.

Censers are used in the Roman Catholic, Anglo-Catholic, Old Catholic and Eastern Orthodox sects of the Christian religion during important rituals such as benedictions, processions and important masses.

Early Jewish Symbol of God
In Genesis 15, a chapter of the Bible , God instructs Abraham to cut a heifer, a she goat, a ram, a turtledove, and a young pigeon into halves. When it got dark, "a smoking fire pot and a flaming torch passed between the pieces", and later God made a covenant with Abraham granting him and his heirs extensive lands between the River of Egypt (either the Nile or the Wadi el Arish in the Sinai) and the Euphrates.

Texts from Mari in northern Mesopotamia from about the same period say that parties entering into a covenant would seal the agreement by cutting a donkey in half and then walking between the severed pieces. One interpretation of the ceremony described in Genesis 15 is that God made an unconditional covenant when God alone (symbolized by the fire pot, or the fire in it) passed between the two halves of the slaughtered animals.

Japanese Kodo Ceremony
Kōdō  (香道 - Way of Fragrance) is the Japanese art of appreciating incense, and involves using incense within a structure of codified conduct. Participants sit near one another and take turns smelling incense from a censer as they pass it around the group. Participants comment on and make observations about the incense, and play games to guess the incense material.

Sakthi Karagam
Sakthi Karagam is a dance performed in Tamil Nadu with a fire pot on the head in the Mariamman or Durga temple rituals. Today it is danced with a pot decorated with flowers on the head and is known as 'Aatta Karagam' and symbolises joy and merriment. In earlier times, the clay pot, or Karagam, was considered the residence of the local deity during the festival ,[8] which played a crucial role in community bonding. It is not clear whether the pot ever contained fire, or was so named because it was carried over fire by fire walkers.

Descendants of the Fire Pot
Although the fire pot and its ancestor the fire pit are still in use in their original forms, successive technical refinements have led to many modern descendants whose origin in the simple clay container might be hard to guess. Some have been driven by the need to adapt to new fuels, such as charcoal, oil, coal, coke, kerosene, propane, electricity and microwaves. Others have been made possible through discovery of new materials such as iron, bronze, ceramics and asbestos. Always the motive would have been to improve the design, to make a device for managing fire that was cheaper, more robust, more convenient, more capable of meeting new demands. Often improvements made for industrial purposes found their way into improved cooking devices, and vice versa.

An incomplete list of fire pot descendants includes:

Brazier: A standing or hanging metal bowl or box containing the fire, with perforations for ventilation. A Hibachi is a type of brazier.
Stove: An enclosed space containing the fire, with dampers and regulators to adjust the draft and thus control the heat. A stove allows for cleaner, hotter and more efficient use of fuel than a fire pot or brazier.
Oven: An enclosed compartment of a stove, separate from the fire, used for heating, baking or drying. Ovens may have their origin in the practice of enclosing food in clay or leaves before placing it in the fire, still used in Kalua, the traditional cuisine of Hawaii. Ovens make it practical to cook slowly, heating the food throughout, and are the basis of many types of cuisine. Ovens enable pottery and today are used in many industrial processes.
Boiler: A closed vessel in which water is heated. The discovery that boilers could build up explosive pressure if too well sealed led to the invention of the steam engine, a pivotal technology in the Industrial Revolution.

Barbecue: A device for cooking on a grill over a box containing burning wood, charcoal or, more recently, propane or natural gas.

Horno

Horno (/ˈɔːrnoʊ/ awr-noh; Spanish: [ˈoɾno]) is a mud adobe-built outdoor oven used by Native Americans and early settlers of North America. Originally introduced to the Iberian Peninsula by the Moors, it was quickly adopted and carried to all Spanish-occupied lands. The horno has a beehive shape and uses wood as the heat source. The procedure still used in parts of New Mexico and Arizona is to build a fire inside the horno and, when the proper amount of time has passed, remove the embers and ashes and insert the bread to be cooked. In the case of corn, the embers are doused with water and the corn is then inserted into the horno to be "steam"-cooked. When cooking meats, the oven is fired to a "white hot" temperature (approximately 650 °F or 340°C), the coals are moved to the back of the oven, and the meats placed inside. The smoke-hole and door are sealed with mud. A twenty-one-pound turkey will take 2½ to 3 hours to cook. It comes out very succulent. Since the horno is made of adobe, it wicks the moisture into the food in a natural convection.

Horno is the usual Spanish word for "oven" or "furnace", and derives from the Latin word furnus.

This kind of oven was very common in Central Europe, especially in Hungary, and in these days is becoming trendy once again. The Hungarian name for the horno is kemence.


It is quite common in Argentina and Uruguay rural areas, from colonial times to our days, and it is called horno de barro, literally "mud oven".

Espresso Machine

An espresso machine brews coffee by forcing pressurized water near boiling point through a "puck" of ground coffee and a filter in order to produce a thick, concentrated coffee called espresso. The first machine for making espresso was built and patented in 1884 by Angelo Moriondo of Turin, Italy. An improved design was patented in 1901, which was bought by the founder of the "La Pavoni" company which from 1905 produced espresso machines commercially on a small scale in Milan. Multiple machine designs have been created to produce espresso. Several machines share some common elements, such as a grouphead and a portafilter. An espresso machine[1] may also have a steam wand which is used to steam and froth liquids, to include milk, for coffee drinks such as cappuccino and caffe latte.

Espresso machines may be steam-driven, piston-driven, pump-driven, or air-pump-driven. Machines may be manual or automatic.

Moka pots, also known as stove top espresso makers, are similar to espresso machines in that they brew under pressure and the resulting brew shares some similarities, but in other respects differ. As such, their characterization as "espresso" machines is at times contentious, but due to their use of pressure and steam for brewing, comparable to all espresso prior to the 1948 Gaggia, they are accepted within broader uses of the term, but distinguished from standard modern espresso machines.

History

The first machine for making espresso was built and patented by Angelo Moriondo of Turin, Italy, who demonstrated a working example at the Turin General Exposition of 1884. He was granted patent no. 33/256 dated 16 May 1884 (according to the “Bollettino delle privative industriali del Regno d’Italia”, 2nd Series, Volume 15, Year 1884, pages 635 – 655). A certificate of industrial title was awarded to Mr. Moriondo Angelo, of Turin, for an invention called “New steam machinery for the economic and instantaneous confection of coffee beverage, method ‘A. Moriondo’, Plate CXL".

In 1901 Luigi Bezzera of Milan patented improvements to the machine. Bezzera was not an engineer, but a mechanic. He patented a number of improvements to the existing machine, the first of which was applied for on the 19th of December 1901. It was titled “Innovations in the machinery to prepare and immediately serve coffee beverage” (Patent No. 153/94, 61707, granted on the 5th of June 1902). In 1905 the patent was bought by Desiderio Pavoni who founded the “La Pavoni” company and began to produce the machine commercially (one a day) in a small workshop in Via Parini in Milan.

Drive mechanism
Multiple machine designs have been created to produce espresso. Several machines share some common elements.

Varying the fineness of the grind, the amount of pressure used to tamp the grinds, or the pressure itself can be used to vary the taste of the espresso. Some baristas pull espresso shots directly into a pre-heated demitasse cup or shot glass, to maintain a higher temperature of the espresso.

Steam-driven
A steam-driven unit operates by forcing water through the coffee by using steam or steam pressure. The first espresso machines were steam types, produced when a common boiler was piped to four group heads so that multiple types of coffee could be made at the same time.[2] This design is still used today in low-cost consumer machines, as it does not need to contain moving parts.

Piston-driven
The piston, or lever, driven machine was developed in Italy in 1945 by Achille Gaggia, founder of espresso machine manufacturer Gaggia. The design generically uses a lever, pumped by the operator, to pressurize hot water and send it through the coffee grinds. The act of producing a shot of espresso is colloquially termed pulling a shot, because these lever-style espresso machines required pulling a long handle to produce a shot.

There are two types of lever machines; manual piston and spring piston design. With the manual piston, the operator directly pushes the water through the grounds. In the spring piston design, the operator works to tension a spring, which then delivers the pressure for the espresso (usually 8 to 10 bar; 116 to 145 psi).

Pump-driven
A refinement of the piston machine is the pump-driven machine, which was introduced in the Faema E61 in 1961, and has become the most popular design in commercial espresso bars. Instead of using manual force, a motor-driven pump provides the force necessary for espresso brewing. Espresso machines are made to accept water directly from a cold water line supply, common in commercial installations, or from a separate tank that must be filled with water by hand. The latter is more common with lower-volume commercial installations and domestic espresso machines.

Four variants exist in home machines, depending on how brew water and steam are boiled; in discussion these are generally known by acronyms.

Single Boiler (SB)
These machines can brew only, and not steam, requiring only a single boiler. They are relatively uncommon, with steam wands being a simple and valued addition.

Single Boiler, Dual Use (SB/DU)
Some home pump espresso machines use a single chamber both to heat water to brewing temperature and to boil water for steaming milk. However, they can perform only one operation at a time, requiring a warm up period between the execution of espresso pull and the milk frothing process. Since the temperature for brewing is less than the temperature for creating steam the machine requires time to make the transition from one mode to the other. SB/DUs are generally found within the lower tiers of enthusiast home models, with steam wands being a simple and valued addition.

Heat Exchanger (HX)
Some machines use a single boiler kept at steaming temperature, but water for brewing is passed through a heat exchanger, taking some heat from the steam without rising to the same temperature. Although the water for brewing remains at a lower range than that required for steaming milk, it is still too hot for proper coffee extraction without first cooling; thus this type of machine requires a cooling flush of 4–6 seconds prior to the first espresso pull. Once the machine is dialed into the proper temperature, as many shots can be pulled as required without refreshing. However, if the user leaves the machine idle again for some period, the flushing process will need to be repeated. The HX variety is found in many mid-range machines and many users install thermometers to assist them is dialing in correct temperatures. There is some controversy as to the temperature stability of the brewing water, since it is indirectly converted from steaming temperature to brewing temperature, rather than kept at a brewing temperature.
The first HX was the Faema E61 of 1961.

Dual Boiler (DB)
Finally, in some espresso machines for commercial or home use, water for brewing is heated in a separate chamber, which requires two separate boilers. This is found primarily in higher-end machines, though it is also found in some mid-range machines, overlapping with HX.
The term "Dual Boiler" is used narrowly for machines with two separate boilers, and more broadly for what are more properly called "Dual Heater" (DH) machines,[citation needed] featuring a boiler for brewing and a separate thermoblock (TB) for heating brew water to steaming temperature – opposite to HX machines, where the boiler is at steaming temperature and is cooled to brewing temperature.
In principle, TB machines yield a more stable brew temperature at the expense of steaming performance and speed, while HX machines yield better steaming at the expense of stable brew temperature. True DB machines provide stable brew temperatures and fast steaming, but are larger and more expensive.

Air-pump-driven
In recent years air-pump driven espresso machines have emerged. These machines use compressed air to force the hot water through the coffee grounds. The hot water is typically added from a kettle or a thermo flask. The compressed air comes from either a hand-pump, N2 or CO2 cartridges or an electric compressor. One of the advantages of the air-pump driven machines is that they are much smaller and lighter than electric machines. They are often handheld and portable. The first air-pump driven machine was the AeroPress, which was invented by Alan Adler, an American inventor, and introduced in 2005. Handpresso Wild, invented by Nielsen Innovation SARL, a French innovation house, was introduced in 2007.

Machine parts
A grouphead (or group head) is the receiver for the removable portafilter (or group handle). A typical consumer espresso machine normally has only one grouphead, while popular professional machines, such as those used at commercial coffee shops, can contain anywhere from one to seven. During the process of extracting a shot of espresso, hot water is forced through the grouphead under pressure. The grouphead contains many holes (the shower) that attempt to distribute the pressurised water evenly over the surface of the grinds in the portafilter basket and thereby achieve an even cross sectional flow.
A portafilter (or group handle) attaches to the grouphead of semi-automatic and piston-driven espresso machines, and carries a tamped puck of coffee grounds within its basket. It is usually made of brass for better heat retention, and is attached by a plastic or wooden handle. The portafilter forms a seal with the espresso machine's gasket, and directs high-pressure hot water through the coffee puck. After-market retailers also sell bottomless portafilters that minimize the espresso's contact with any metal. A bottomless portafilter is one tool baristas use to analyze the quality of the coffee grind and the evenness of the extraction and allows for a visual check of "channeling" or the condition in which water is able to pierce a hole in the espresso puck during the brew process leading to poor extraction. Often, baristas use knockboxes to store their spent espresso grounds after they have pulled a shot.

Automation
Machines that have pumps, sensors, valves, and grinders to automate the brewing process are generally referred to as automatic.

Semi-automatic use a pump rather than manual force to deliver water. The remaining brew pressure in the basket is released via a three-way valve.
Automatic machines also automate the brewed volume (hence indirectly brew time). They do this by adding an in-line flowmeter to the grouphead: when the programmed amount of water has passed through the meter, the pump turns off. Grinding and tamping are still manual.
Super-automatic machines automatically grind the coffee, tamp it, and extract the espresso shot. The operator only has to fill the bean hopper and, if the machine is not connected to a water line, add water to a reservoir. Some models contain an automated milk frothing and dispensing device. Super-automatic machines take away the ability to manually tamp and grind the coffee, which may affect the quality of the espresso.
Commercial establishments generally use semi-automatic machines with several group heads. These are much larger than consumer models and able to produce espresso shots more quickly. Many commercial machines can function in an automatic mode.

Manual or semi-automatic machines offer more control of shot quality. Because when to cut the shot (brew time) is a critical variable, which is often adjusted shot-by-shot, semi-automatic machines are often preferred over automatics, though some machines are automatic.[5] Manual machines are more popular in Europe, where it is more common to drink straight espresso.

Most super-automatic machines are more compact than a machine with a separate grinder.

Stove top[
Moka pots, also known as stove top espresso makers, are similar to espresso machines in that they brew under pressure and the resulting brew shares some similarities, but in other respects differ. As such, their characterization as "espresso" machines is at times contentious, but due to their use of pressure and steam for brewing, comparable to all espresso prior to the 1948 Gaggia, they are accepted within broader uses of the term, but distinguished from standard modern espresso machines.

Moka pots are similar to espresso machines in that they brew under pressure, produce coffee with an extraction ratio similar to that of a conventional espresso machine, and, depending on bean variety and grind selection, moka pots can create the same foam emulsion known as crema that conventional espresso machines can.

Moka pots differ from espresso machines in that they brew under substantially lower pressure – 1.5 bars (21 psi) rather than 9 bars (130 psi) – and use hotter water – a mix of boiling water and steam at above 100 °C (212 °F), rather than 92–96 °C (197.6–204.8 °F) of espresso machines, similar to early steam brewing machines.


The bottom chamber contains the water. The middle chamber is a filter-basket holding the ground coffee and sits within the bottom chamber. The top chamber, with a metal filter, screws onto the bottom chamber. When the pot is heated on a stove, the pressure from the steam in the bottom chamber forces the water through a tube into the filter-basket, through the ground coffee, the metal filter, and it then funnels into the top chamber where the coffee is then ready to serve. They are commonly found in Italy, Spain and Portugal. They are also known as a "macchinetta", Italian for "little machine" or "caffettiera", Italian for coffee maker.

Earth Oven

An earth oven, ground oven or cooking pit is one of the simplest and most ancient cooking structures. At its most basic, an earth oven is a pit in the ground used to trap heat and bake, smoke, or steam food. Earth ovens have been used in many places and cultures in the past, and the presence of such cooking pits is a key sign of human settlement often sought by archaeologists. Earth ovens remain a common tool for cooking large quantities of food where no equipment is available. They have been used in various civilizations around the world and are still commonly found in the Pacific region to date.

To bake food, the fire is built, then allowed to burn down to a smoulder. The food is then placed in the oven and covered. This covered area can be used to bake bread or other various items. Steaming food in an earth oven covers a similar process. Fire-heated rocks are put into a pit and are covered with green vegetation to add moisture and large quantities of food. More green vegetation and sometimes water are then added, if more moisture is needed. Finally, a covering of earth is added over everything. The food in the pit can take up to several hours to a full day to cook, regardless of the dry or wet method used.

Today, many communities still use cooking pits for ceremonial or celebratory occasions, including the indigenous Fijian lovo, the Hawaiian luau, the Māori hāngi and the New England clam bake. The central Asian tandoor use the method primarily for uncovered, live-fire baking, which is a transitional design between the earth oven and the horizontal-plan masonry oven. This method is essentially a permanent earth oven made out of clay or firebrick with a constantly burning, very hot fire in the bottom. In modern times, earth ovens are sometimes used for outdoor cooking and recreational meals in lieu of an open campfire.

Americas

In many areas, archaeologists recognize "pit-hearths" as being commonly used in the past. In Central Texas, there are large "burned-rock middens" speculated to be used for large-scale cooking of plants of various sorts, especially the bulbs of sotol. The Mayan pib and Andean watia are other examples.

The clam bake, invented by Native Americans on the Atlantic seaboard and considered a traditional element of New England cuisine, traditionally uses a type of ad hoc earth oven (usually built on the beach). A large enough hole is dug into the sand and heated rocks are added to the bottom of the hole. A layer of seaweed is then laid on top to create moisture and steam, followed by the food. Lastly, another layer of seaweed is added to trap in the steam and cook the food, which mainly consists of shellfish and vegetables.

The Curanto of the Chiloé Archipelago consists of shellfish, meat, potatoes, milcao chapaleles, and vegetables traditionally prepared in an earth oven. It has spread to the southern areas of Chile.

Middle East and North Africa

Earth oven cooking is sometimes used for celebratory cooking in North Africa, particularly Morocco: a whole lamb is cooked in an earth oven (called a tandir, etymologically related to the Central- and South-Asian tandoor and possibly descended from an Akkadian word tinuru) in a manner similar to the Hawaiian kalua. Among Bedouin and Tuareg nomads, a simple earth oven is used – often when men travel without family or kitchen equipment in the desert. The oven is mostly used to bake bread but is also used to cook venison such as waran. When baking bread, the wheat or barley flour is mixed with water and some salt and then placed directly into the hot sands beneath the camp fire. It is then covered again by hot coal and left to bake. This kind of bread is eaten with black tea (in the absence of labneh). The sand has to be knocked off carefully before consuming the bread. Sometimes this type of bread is also made when the family is together, because people like the taste of it. The bread is often mixed with molten fat (sometimes oil or butter) and labneh (goat milk yoghurt) and then formed into a dough before eating. This bread is known as Arbut but may be known under other local names.

 The Pacific

Earth oven cooking was very common in the past and continues into the present – particularly for special occasions, since the earth oven process is very labor-intensive.

In some part-Melanesian, Polynesian, and other closely related languages, the general term is "umu," from the Proto-Oceanic root *qumun (e.g. Tongan ʻumu, Māori umu or hāngi, Hawaiian imu, Sāmoan umu, Cook Island Māori umu). In some non-Polynesian, part-Polynesian, and Micronesian parts of the Pacific, languages are more diverse so each language has its own term - in Fiji it is a lovo and in Rotuman it is a koua.

Despite the similarities, there are many differences in the details of preparation, their cultural significance, and current usage.

Samoan Umu

The Samoan umu uses the same method of cooking as many other earth ovens and is closely related to the Hawaiian earth oven, the imu, which is made underground by digging a pit (although generally the umu is done above ground rather than in a pit). It is a common day-to-day method of preparing roasted foods, with modern ovens being restricted to western-style houses. In the traditional village house, gas burners will be used inside the house to cook some food in pots. The umu is sheltered by a roof in case of rain, and it is separate from the house. There are no walls, which allows the smoke from the umu to escape.

The Samoan umu starts with a fire to heat rocks which have been tested by fire as to whether they will explode upon heating. These rocks are used repeatedly but eventually are discarded and replaced when it is felt that they no longer hold enough heat. Once the rocks are hot enough, they are stacked around the parcels of food which are wrapped in banana leaves or aluminium foil. Leaves are then placed over the assembly and the food is left to cook for a few hours until it is fully cooked.

Hawaiian Imu

The Hawaiian imu was the easiest way to cook large quantities of food quickly and efficiently for the Hawaiians. Because their creation was so labor-intensive, imus were only created for special events or ceremonies where it would be worth the time and hard work. An imu is created by first digging a 2- to 4-foot hole in the ground. Porous rocks are heated for a while and subsequently added to the bottom of the pit; next, a layer of banana stumps is added on top of them along with banana leaves. After the vegetation is laid down, the meat, fish, and any other foods are placed on top and covered once again with more vegetation. Wet cocoa sacks are also sometimes added on top to add even more moisture and trap in more heat.

Europe


Although not believed to be common in Europe, earth ovens were used from the Neolithic period onwards with examples from this period found at the sites of Rinyo and Links of Notland on Orkney, but are more commonly known in the Bronze and Iron Ages from sites such as Trethellan Farm, Newquay[citation needed] and Maiden Castle, Dorset[citation needed]. Examples from these periods vary in form but are generally bowl-shaped and shallow in depth (30–45 cm) with diameters between 0.5 and 2 metres. In Greek cuisine, there is also a tradition of kleftiko ("thief style") dishes, ascribed to anti-Turkish partisans during the Greek War of Independence, which involve wrapping the food in clay and cooking it in a covered pit, allegedly at first to avoid detection by Turkish forces.

Deep Fryer

A deep fryer (also known as a frier, deep fat fryer or fryolator) is a kitchen appliance used for deep frying. While commonly used in commercial kitchens, household models are available and have become common.

 Features

Modern fryers feature a basket to raise food clear of the oil when cooking is finished. Fryers often come with features such as timers with an audible alarm, automatic devices to raise and lower the basket into the oil, measures to prevent food crumbs from becoming over cooked, ventilation systems to reduce frying odors, oil filters to extend the usable life of the oil, and mechanical or electronic temperature controls. Deep fryers are used for cooking many fast foods, and making them crisp.

 Construction

The modern commercial fryer boasts improved energy efficiency due in part to better heat transfer systems. Commercial fryers with infrared heating or convection heating are efficient, but often expensive. The most common fryer models are electric and gas.

Electric restaurant fryers are popular in counter top models because of their mobility. They lose a little less heat than gas fryers because their heating elements are immersed in the oil, and they have a faster temperature recovery time between frying cycles. Gas fryers heat up more quickly and to a higher cooking temperature than electric fryers. Gas fryers can be powered by either natural gas or propane, both of which are generally less expensive energy sources than electricity. This makes gas power especially popular in floor model fryers.

Commercial fryers are generally available in mild steel or stainless steel. Stainless steel is less likely to corrode or stain than mild steel. Mild steel also expands under heat which may damage the welds over time. Because of this, stainless steel fryers often come with a much better warranty than mild steel fryers.

Fryers are available with a variety of fry pot styles. Some commercial fryers have a “cold zone” at the bottom of the fry pot. This is where larger food particles sink and the lower temperature keeps them from burning and tainting the oil. A tube-style fry pot has a large cold zone because the tubes are slightly above the bottom of the vat, leaving generous space for cooler oil and crumbs. This is particularly useful for cooking heavily breaded foods (such as a blooming onion). A tube-style fry pot is more difficult to clean than an open fry pot, but the tubes allow easy access to the heat source. Tube fryers are often a little less expensive than their open fry pot counterparts. Open fry pots have an external heat source, which makes them easier to clean and affords better access to the oil, but they generally offer a smaller cold zone, so food particles that sink could scorch and pollute the flavor of the oil. However, these fryers work very well for lightly breaded foods. Flat-bottomed restaurant fryers—another type of open frypot fryer—can also be difficult to clean and have no cold zone, but they are highly effective for frying dough (such as donuts or funnel cakes). Flat-bottom fryer pots may also be used with a batter trapping insert that keeps loose batter from quickly scorching on the bottom where heat is normally applied. A batter trap can also help keep loose batter from being stirred up in the oil and adhering to subsequent batches of food in order to make foods taste better and the cooking oil lasts longer.

Some domestic fryers utilize an angled motorized rotary basket that circulate its contents through the hot oil. This design requires approximately half the amount of oil that a more traditionally designed fryer would require. Domestic fryers are generally smaller in size and capacity. Domestic fryers generally range between 2 - 4 liters capacity.

 Temperature controls

Many of the new fryer models include electronic temperature controls. These computerized controls save energy by constantly sensing and adjusting the temperature of the oil. A high quality thermostat can stay within a 7.2 ˚C range of a desired temperature, assuring accurate cook times. Safety thermostats that automatically cut the power if the oil reaches dangerous temperatures help prevent oil fires.

Oil filtration

An oil filtration system, chemical treatment, or diatomaceous earth powder all help remove tiny food particles that are not always visible. Using these systems doubles the life of the oil. Oil filtration systems can sometimes be purchased as an enclosed part of the fryer to avoid involving employees in the somewhat dangerous process of filtering the oil with an exterior system. Many restaurants use a portable oil filtration system to transport waste oil to a disposal area. However, even old oil is not completely useless. There are ways (involving other chemicals and machinery) to “recycle” old oil as biodiesel that can power diesel vehicles.

Accessories

Restaurant fryers are available with a wide array of accessories and options. There are countertop models, single floor models, and “fryer batteries” with multiple floor fryers, a filtration system, and holding stations all built together as one large floor fryer system. Individual fryers may have one or more tanks. Commercial floor-model fryers can be fitted with casters for easier maintenance and cleanup. Fry baskets also come in various shapes and sizes, from taco salad bowls to onion loaf baskets, with or without heat resistant handles.

Automated deep fryers

Industrial enterprises producing deep-fried snack foods such as potato chips or pre-fried French fried potatoes use automated frying systems that consist mainly of the actual frying pan, a tube type heat exchanger to heat the frying oil, a filter, a circulation pump, a banana tank for fresh oil and the automation system, most often a PLC. As the product leaving the fryer contains a percentage of oil (in potato chips approx. 35%)[citation needed] there is a constant flow of fresh oil into the system. Sensors for the temperature of the oil, the oil level, different pressures in the system and other parameters are used as input for the PLC.

Fire risks

Naturally, a malfunctioning and/or misused deep fryer poses a serious fire risk, especially with gas-powered deep fryers. Furthermore, putting water on oil fires will cause a fire boilover and aggravate the situation. There are special fire extinguishers and hood-based fire suppression systems for food oil fires, often using alkaline chemicals such as potassium citrate and potassium acetate that react with the oils, trap the steam and vapors, and thus suppress the fire by saponification.

Domestic fryers often include a safety cut-out in case of overheating, for example if not enough oil is used or the fryer is switched on whilst empty. A reset button is included on most of these fryers to reset the safety device once the unit has cooled down; if a reset button is not included the fryer may need repairing if the safety device activates.