Deep frying (also referred to as deep fat frying) is a cooking method in which food is submerged in hot fat, such as oil. Normally, a deep fryer or chip pan is used for this; industrially, a pressure fryer or vacuum fryer may be used. Deep frying may also be performed using oil that is heated in a pot. Deep frying is classified as a dry heat cooking method because no water is used. Typically, deep frying cooks foods quickly: all sides of a food are cooked simultaneously as oil has a high rate of heat conduction.
The practice of deep frying food has been around for over 7000 years, but many modern deep fried foods were not invented until the 19th century. Deep frying is popular worldwide and accounts for a large percentage of global caloric consumption. This is despite the hazards caused by deep frying to the chef, to the environment, and the increased risk of heart attacks and obesity linked to the consumption of deep fried foods.
Although the nouns "deep-fried", "deep-frying", and the verb "deep-fry" were not documented until 1916, 1932, and 1933 (respectively); the practice of deep frying food has been around much longer. One of the earliest known practices of deep frying came from the Egyptians in the 5th millennium BCE. Later developments included the Greek's deep frying food in olive oil in the 5th century BCE. In the 1st century CE, a Roman cookbook, Apicius, appears to list the ancient Romans first use of deep frying to prepare Pullum Frontonianum. The practice of deep frying spread to other parts of Europe and Arabia in the following centuries. Deep fried foods such as funnel cakes arrived in northern Europe by the 13th century, and deep fried fish recipes have been found in cookbooks in Spain and Portugal at around the same time. Falafel arrived in the Middle East from population migrations from Egypt as soon as the 14th century. Eastern cultures including the Chinese and Japanese had developed techniques for deep frying by the 16th century. It is possible that deep frying was introduced by the Portuguese at this time. Evidence of potato frying can be found as early as the late 17th century in Europe.
Modern deep frying began in the 19th century with the growing popularity of cast iron, particularly around the American South which lead to the development of many modern deep fried dishes. French fries, invented in the late 18th century, became popular in the early 19th century western Europe. Donuts were invented in the mid 19th century, with foods such as onion rings, deep fried turkey, and corn dogs all being invented in the early 20th century. In recent years, the growth of fast food has expanded the reach of deep fried foods, especially french fries. In 2014, over two million tons of fries were consumed in the United States with chains such as McDonald's accounting for over one third of all sales.
Deep frying food is defined as a process where food is completely submerged in hot oil at temperatures typically between 350 °F (177 °C) and 375 °F (191 °C). One common method for preparing food for deep frying involves adding multiple layers of batter around the food, such as with cornmeal, flour, or tempura, bread crumbs are sometimes also used. After the food is submerged in oil, the surface of it begins to dehydrate and it under goes Maillard reactions which break down sugars and proteins, creating the golden brown exterior of the food. Once the surface is dehydrated; it forms a crust which prevents further oil absorption. The heat conducts throughout the food causing proteins to denature, starches to under go starch gelatinization, and dietary fiber to soften.
While most foods need batter coatings for protection, it is not as necessary for cooked noodles and potatoes because their high starch content enables them to hold more moisture and resist shrinking. Meats may be cooked before deep frying to ensure that they are done inside while keeping juiciness.
When performed properly, deep frying does not make food excessively greasy, because the moisture in the food repels the oil. The hot oil heats the water within the food, steaming it; oil cannot go against the direction of this powerful flow because (due to its high temperature) the water vapor pushes the bubbles toward the surface. As long as the oil is hot enough and the food is not immersed in the oil for too long, oil penetration will be confined to the outer surface. Foods deep fried at proper temperatures typically absorb "no more than a couple of tablespoons per 2 1⁄2 cups of oil" used. This oil absorption rate is around the same as occurs with shallow frying, such as in a pan.
However, if the food is cooked in the oil for too long, much of the water will be lost and the oil will begin to penetrate the food. The correct frying temperature depends on the thickness and type of food, but in most cases it lies between 350–375 °F (177–191 °C). An informal test for a temperature close to this range involves adding a tiny amount of flour into the oil and watching to see if it sizzles without immediately burning. A second test involves adding one piece of food to deep fry and watching it sink somewhat and rise back up. Sinking without resurfacing indicates that the oil is too cold; not sinking at all indicates that the oil is too hot.
It is recommended that deep fryers be cleaned often to prevent contamination. The process of cooking with oil can also contaminate nearby surfaces as oil may splatter on adjacent areas. Oil vapors can also condense on more distant surfaces such as walls and ceilings. Supplies such as dish detergent and baking soda can effectively clean affected surfaces.
It has been considered that oils that do not break down at deep frying temperatures are best. These are the types of oil that have received positive feedback regarding deep frying: peanut oil, safflower oil, sunflower oil and canola oil.
Deep frying is done using a machine known as a deep fryer, a flat pan such as a wok, a Dutch oven, or a cast-iron pot. Additional tools include fry baskets, which are used to contain foods in a deep fryer and to strain foods when removed from the oil, and cooking thermometers, used to gauge oil temperature. Tongs, slotted spoons, wooden spoons, and sieves may be used to remove or separate foods from the hot oil.
Japanese deep frying tools include long metal chopsticks; the agemono-nabe deep frying pot, which is heavy for retaining heat and deep for holding oil; the ami-shakushi net ladle used for scooping out batter debris; and the abura-kiri oil drying rack pan.
A deep fryer with slotted spoon, for removing foods from the hot oil
Slotted and perforated wooden spoons
A strainer used in the preparation of empanadas
Dishes, foods, and culture
Deep-fried foods are common in many countries, and have also been described as "a staple of almost all street cuisines on all continents". There are hundreds of dishes that are associated with deep frying as most foods can be deep fried. Examples of food that can be deep-fried include meat, poultry, fish and vegetables. Fish and chips, for instance, combines deep-fried fish and deep-fried potatoes. French fries, doughnuts, onion rings, and hushpuppies are common deep-fried foods. Other common deep fried foods include Chinese You Bing deep-fried pancakes, Southeast Asian Jin deui, and Japanese tempura. Less common deep-fried foods include maple leaves, peanut butter and jelly sandwiches, pizza, and Snickers bars.
In the United States, the Chicago Tribune notes that "you can deep fry almost anything". The American South has been noted as a modern center of innovation in the area of deep fried food. According to the owner of a deep frying restaurant in the South, "If something is edible, you can bet that someone south of the Mason-Dixon line has tried to cook it in oil.
In Northern Africa, deep-fried dishes are a part of the cuisine. A common food in this region is the deep-fried fritter, also referred to as "sponges". In areas of Southern Africa, street foods include deep-fried potato and cassava chips. Deep-fried foods in the country of South Africa include fish and chips and koeksisters, among others.
Japanese tempura is a popular deep fried food that generally consists of battered and fried seafood and vegetables. Japanese deep-fried dishes, or Agemono, include other styles besides tempura, such as Karaage, Korokke, Kushikatsu, and Tonkatsu. In areas of south-east Asia such as Thailand, insects are commonly deep fried for human consumption. Western-style fast food items such as donuts, deep-fried chicken, and deep-fried potatoes are also becoming popular in Asia.
Many countries in Europe use pure or hydrogenated rapeseed oil for deep-frying. The deep-fried Mars bar originated in Scotland, with The Carron Fish Bar in Stonehaven claiming to have invented it in the early 1990s. Fish and chips is a very popular deep fried dish in England since it originated in London in the 19th century and became popular among the working class. Its popularity continues with 229 million portions of fish and chips being sold annually in England.
There is an annual trade fair devoted to deep fried foods called the International Symposium on Deep-Fat Frying run by Oils & Fats International. It features discussions on deep fat frying as well as exhibitions by various companies involved with the process. In September 2015 it will be held in Munich, Germany.
In the United States, soybean oil is often used for deep-frying. Beignets, originally a French dish, are a popular deep-fried pastry in the U.S. city of New Orleans. Deep-fried food has been a core part of the culture of the American South with many restaurants solely serving deep-fried foods. The owner of one such restaurant has said that the deep-fried food, "in the South it's a way of life". Fast food is one of the most common ways to consume deep-fried food in North America.
Novelty deep-fried foods are popular today in American fairs, especially those in the American South. Hundreds of items are served at these fairs. Some of them include deep fried beer, butter, and bubblegum. Additionally, deep frying can be used as a form of artwork by frying non-edible objects, such as electronics. Artists such as Henry Hargreaves have deep fried replicas of electronic items such as iPads, Game Boys, and laptops.
Deep-fried food contests are frequently held at fairs such as the Texas State Fair, where they hold an annual contest for the most creative deep-fried food. Notable past winners have included fried Coke and deep-fried butter, both invented by Abel Gonzales. Since 2013, an American reality competition show called Deep Fried Masters, produced by Discovery Networks, holds deep frying competitions at several state fairs across the country.
The buñuelo, a fried dough ball popular in Central America ad Greece, is a popular deep-fried snack and street food in South America. Picarones, a Peruvian dessert originated in the colonial period, are deep-fried cakes made with pumpkin and sweet potatoes, popular in Peru and Chile, especially during harvest festivals.
Overheating or over-using the frying oil leads to formation of rancid-tasting products of oxidation, polymerization, and other deleterious, unintended or even toxic compounds such as acrylamide (from starchy foods). Recent research suggests fat deterioration may be worse when fat or oil is fried with food than when fat or oil is tested on its own in a laboratory. Deep-frying under vacuum helps to significantly reduce acrylamide formation, but this process is not widely used in the food industry due to the high investment cost involved.
Some useful tests and indicators of excessive oil deterioration are the following:
- Sensory – darkening, smoke, foaming, thickening, rancid taste and unpleasant smell when heating. This is the most unreliable way to decide when to change oil because those are very individual factors and can depend on different causes.
- Tesing strips – decide when to change oil depending on FFA (free fatty acids) only
- Oiltester – measurement tool to exactly define the point of change oil by TPM/TPC (Total polar material/compounds)
- Laboratory – acidity, anisidine value, viscosity, total polar compounds, polymeric triglycerides.
Instruments that indicate total polar compounds, currently the best single gauge of how deep-fried an object is, are available with sufficient accuracy for restaurant and industry use.
Cooking oil is flammable, and fires may be caused by it igniting at too high a temperature. Further, attempts to extinguish an oil fire with water cause an extremely dangerous condition, a boilover, as they cause the water to flash into steam due to the high heat of the oil, in turn sending the burning oil in all directions and thus aggravating the fire. This is the leading cause of house fires in the United Kingdom. Instead, oil fires must be extinguished with a non-water fire extinguisher or by smothering. Other means of extinguishing an oil fire include application of dry powder (e.g., baking soda, salt) or fire fighting foam. Most commercial deep fryers are equipped with automatic fire suppression systems using foam.
Spilled hot cooking oil can also cause severe third degree burns, In the worst-case scenario, severe burns can be fatal. The higher temperatures and tendency of oil to stick to the skin make spilled hot cooking oil far more dangerous than spilled hot water. Children can accidentally place their hands on top of the stove, playing with the materials while being cooked, or accidentally pull the pot down, which can cause significant injury. The utmost care should be used when deep frying when children are present, to protect their safety at all times.
Deep frying produces large amounts of waste oil, which must be properly disposed. Waste oil can overflow sewage systems, bind to the walls of sewage pipes, and interfere with sewage treatment. Waste oil from deep frying is increasingly being recycled and refined into biodiesel. Potatoes that are stored in artificially humidified warehouses contain more water, which makes the time required to deep fry them into chips longer. This increases the carbon dioxide footprint of commercially producing chips because more energy is required for frying over a longer time. According to one source, an average home appliance deep fryer draws 2,000 watts.
The process of deep frying food is generally detrimental to its nutritional value. The oils that foods absorb in their batter typically contain large amounts of fats, especially saturated fats and trans fats. Consumption of large amounts of saturated and trans fats has been linked to a higher risk for some cancers including prostate cancer. Eating deep-fried foods has also been linked to higher cholesterol levels, obesity, heart attacks, and diabetes. Deep-fried foods cooked at certain temperatures can also contain acrylamide, a carcinogen. Additionally, fat degradation processes during deep frying results in the loss of nutritional value in deep-fried foods.
Some studies have found that deep frying in olive and sunflower oils has been found to negatively impact health less and in some cases have positive effects on insulin levels. Oil can be reused a few times after original use after straining out solids. However, excessive use of the same oil can cause it to break down and release compounds into the food that may be carcinogenic, affect liver health, or influence the body's ability to absorb vitamins. Some European countries have public health standards set for the safety of frying oil.
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