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Cookware materials
Metal
Metal pots are made from a narrow range of metals because pots and pans need to conduct heat well, but also need to be chemically unreactive so that they do not alter the flavor of the food. Most materials that are conductive enough to heat evenly are too reactive to use in food preparation. In some cases (copper pots, for example), a pot may be made out of a more reactive metal, and then tinned or clad with another.
Aluminum
Aluminum is a lightweight metal with very good thermal conductivity. It does not rust, and is resistant to many forms of corrosion. Aluminum can however react with some acidic foods to change the taste of the food. Sauces containing egg yolks, or vegetables such as asparagus or artichokes may cause oxidation of non-anodized aluminum. Since 1965 circumstantial evidence has linked Alzheimer’s disease to aluminum, but to date there is no proof that the element is involved in causing the disease, and it is now considered unlikely. Aluminum is commonly available in sheet, cast, or anodized forms.
Sheet aluminum is spun or stamped into form. Due to the softness of the metal it is commonly alloyed with magnesium, copper, or bronze to increase its strength. Sheet aluminum is commonly used for baking sheets, pie plate, and cake or muffin pans. Stockpots, steamers, pasta pots, and even skillets are also available from sheet aluminum.
Anodized aluminumCast aluminum produces a thicker product than sheet aluminium, making it suitable for saucepots, Dutch ovens, and heavyweight baking pans such as bundt pans. Due to the microscopic pores caused by the casting process cast aluminium has a lower thermal conductivity than sheet aluminum.
Anodized aluminum has had the naturally occurring layer of aluminium oxide thickened by an electrolytic process to create a surface that is hard and non-reactive. It is used for sauté pans, stockpots, roasters, and Dutch ovens.
Copper
Classically in Western cooking, the best pots were made out of a thick layer of copper for good thermal conductivity and a thin layer of tin to prevent the copper from reacting with acidic foods. Copper pans provide the best conductivity, and therefore the most even heating. They tend, however, to be heavy, expensive, and to require occasional retinning. They are now available with stainless steel rather than tin linings which last much longer. They are best for such high-heat, fast-cooking techniques as sautéeing.
Cast Iron
Main article: Cast iron cookware
Cast iron cookware is slow to heat, but once at temperature provides even heating. Cast iron can also withstand very high temperatures, making cast iron pans ideal for searing. Being a reactive material, cast iron can have chemical reactions with high acid foods such as wine or tomatoes. In addition, some foods (such as spinach) cooked on bare cast iron will turn black.
Cast iron is a porous material that rusts easily. As a result, it typically requires seasoning before use. Seasoning creates a thin layer of fat and carbon over the iron that coats and protects the surface, and prevents sticking.
Stainless Steel
Stainless steel is an iron alloy containing a minimum of 11.5% chromium. Blends containing 18% chromium with either 8% nickel,called 18/8, or with 10% nickel, called 18/10, are commonly used for kitchen equipment. Stainless steel’s virtues are a resistance to corrosion, it does not react with either alkaline or acidic foods, and it is not easily scratched or dented. Stainless steel’s drawback for cooking use is that it is a relatively poor heat conductor. As a result, stainless steel cookware is generally made with a disk of copper or aluminium in or on the base to conduct the heat across the base.
Carbon Steel
Carbon steel cookware can be rolled or hammered into very thin sheets of material, while still maintaining high strength and heat resistance. This allows for rapid and high heating. Carbon steel does not conduct heat as well as other materials, but this may be an advantage for woks and paella pans, where one portion of the pan is intentionally kept at a different temperature than the rest. Like cast iron, carbon steel must be seasoned before use. Rub a fat (lard is recommended) on the cooking surface only and heat the cookware over the stovetop. The process can be repeated if needed. Over time the cooking surface will become dark and nonstick. Carbon steel is often used for woks and crepe pans.
Coated and composite cookware
Enameled cast iron
Enameled cast iron cooking vessels are made of cast iron covered with a porcelain surface. This creates a piece that has the heat distribution and retention properties of cast iron combined with a non-reactive, low-stick surface.
Enamel over steel
The enamel over steel technique creates a piece that has the heat distribution of carbon steel and a non-reactive, low-stick surface. Such pots are much lighter than most other pots of similar size, are cheaper to make than stainless steel pots, and do not have the rust and reactivity issues of cast iron or carbon steel. Enamel over steel is ideal for large stockpots, and for other large pans that will be used mostly for water-based cooking. Because of its light weight and easy cleanup, enamel over steel is also popular for cookware used while camping.
An All-Clad stainless-over-aluminum panClad aluminum or copper
Cladding is a technique for fabricating pans with a layer of heat conducting material, such as copper or aluminum, covered by a non-reactive material, such as stainless steel. Rather than just a heat-distributing disk on the base, the copper or aluminum extends over the entire pan.
Aluminum pans are typically clad on both their inside and the outside surfaces, providing both a stainless cooking surface and a stainless surface to contact the cooktop. Copper is typically clad on its interior surface only, leaving the more attractive copper exposed on the outside of the pan.
Some high-end cookware uses a dual-clad process, with a thin stainless layer on the cooking surface, a thick core of aluminum to provide structure and heat diffusion, and a thin layer of copper on the outside of the pot that provides additional diffusion and the “look” of a copper pot. This provides much of the functionality of tinned-copper pots for a fraction of the price.
Teflon coated frying panNon-stick
Modern metal cooking pans are frequently coated with a substance such as polytetrafluoroethylene (PTFE) coating in order to minimize the possibility of food sticking to the pan surface. This has advantages and disadvantages for flavor and ease of use. A small amount of sticking is needed to cause fond (called a glaze); adding liquid to lift the glaze from the pot is called deglazing. Additionally, nonstick pans should not be left on the stove at a high temperature. On the other hand, they are much easier to clean than other types of pots, and do not often result in burned food. When frying in pans without such a coating, it is necessary to use additional vegetable or animal fat to prevent sticking. The main difference in quality levels of the coatings are in the formulas of the liquid coating, the thickness of each layer and the number of layers of used.
Nonstick coatings tend to degrade over time, and require vigilant care and attention. In order to preserve the nonstick coating of a pan, it is important never to use metal implements in the pan while cooking, or harsh scouring pads or chemical abrasives when cleaning. Higher quality nonsticks that are more abrasion and degrade resistant use powdered ceramic or titanium mixed in with the nonstick, strengthening it. Some nonstick coatings containing hardening agents are also high enough in quality that they can be used in commercial use. The ones that do, usually contain an NSF label.
There has been controversy surrounding the use of nonstick coatings: while decomposition does not occur at normal cooking temperatures, accidental overheating can produce decomposition products which are toxic to humans and fatal to birds.
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