Basic Principles of Cooking & Food Science Flashcards
Cooking
When we add enough heat to foods, the molecules may move so fast that the structure of the food changes. Example: 1. Sucrose, regular sugar, may break apart and form new molecules that has a brown smell and the taste of caramel 2. Protein molecules may break apart and reform and reform with a different structure.
Caramelization
The browning of sugar by heat. (ex: browning of sautéed vegetable, browning of baked goods, and the maillard reaction (when meat browns) *Carbohydrate Reaction
Gelatinization
The process by which starch granules absorb water and swell in size. *Carbohydrate Reaction
Dextrinization
Dextrinization When starches are heated dry (that is with no water, but with or without fat), some of the long starch chains are broken down into simpler compounds called dextrins, which give the starch a golden or brown color. Since dextrins have less thickening ability that starches, a brown rue has less thickening power than a white rue
Fiber
A group of indigestible carbohydrates found in grains, fruit and vegetables.
Denature
To change the structure of protein molecules by means of heat or chemicals.
Coagulation
The process by which proteins become firm, usually when heated.
Maillard Reaction
A complex chemical reaction that occurs when heated proteins react with carbohydrate molecules, resulting in browning and flavor changes.
Connective Tissues
Certain proteins in meat, poultry, and fish that contribute to toughness; some are broken down by heat and some are not.
Smoke Point
The temperature at which fat begins to deteriorate rapidly and smoke when heated.
Evaporation
The process by which water turns from a liquid to a gas at any temperature.
Emulsion
Uniform mixture of two substances that are normally unmixable. -A familiar example of an emulsion in the kitchen is mayonnaise, which is a mixture of oil and vinegar.
Temporary Emulsion
When two liquids always separate after being shaken or beaten together (a simple oil and vinegar dressing is an example). In a standard vinaigrette, the vinegar is broken into tiny droplets. These droplets are mixed evenly, or suspended, throughout the oil. -The harder a mixture is beaten or shaken the longer it takes for it to separate. -Some ingredients act as stabilizers, which helps mixture to remain emulsified for longer (ex:mustard in a vinaigrette).
Conduction
Conduction Can occur in two ways: 1. When the heat moves directly from one object to something touching it- for example, from the top of the range to a soup pot placed on it, from the pot to the broth inside, and from the broth to the solid food items in it. 2. When heat moves from one part of something to an adjacent part of the same item- for example, from the exterior of a roast to the interior, or from a sauté pan to it’s handle.
Convection
Occurs when heat is spread by the movement of air, steam, or liquid (including hot fat). Ther are two kinds:: 1. Natural- Hot liquids and gases rise, while cooler ones sink. Thus, in any oven, kettle of liquid, or deep-fat fryer a constant, natural circulation distributes heat. 2. Mechanical- When ovens and steamers have fans that speed the circulation of heat. Thus the heat is transferred more quickly to the food and the food cooks faster.
Radiation
Occurs when energy is transferred by waves from a source to the food.
Infrared
Broiling is the most familiar example of this type of cooking. An electric or ceramic element heated by a gas flame becomes so hot it gives off infrared radiation, which cooks the food. -These ovens are designed to heat food rapidly.
Microwave
Microwave The radiation generated by this oven penetrates partway into the food, where it agitates the molecules of water (heat is the motion of molecules). Thus, as the molecules move faster, the temperature of the food rises and the food is cooked. -Since this type of radiation affects only water molecules, a completely waterless material won’t heat up in this oven. -Since this radiation only penetrates no more than about 2 inches into foods, heat is transferred to the center of large pieces of food by conduction, just as in roasting.
Dry-Heat Methods
Method in which the heat is transferred without moisture- that is, by hot air, hot metal, radiation, or hot fat. Usually divided into two categories: 1. With Fat 2. Without Fat
Moist-Heat Methods
Method in which the heat is transferred to the food product by water or water-based liquids such as stock and sauces, or by steam.
Roast
Cook foods by surrounding them with hot, dry air, usually in an oven. Cooking on a spit in front of an open fire is an example. Usually applies to meat and poultry. Cooking uncovered is essential, as a cover would hold in steam and change from dry-heat to moist-heat, which would be braising or steaming.
Bake
Cook foods by surrounding them with hot, dry air, usually in an oven. Usually applies to breads, pastries, vegetables, and fish (more general of a term than roasting). Cooking uncovered is essential, as a cover would hold in steam and change form dry-heat to moist-heat, which would be braising or steaming.
Barbeque
To cook with dry heat created by the burning of hardwood or by the hot coals of this wood. In other words, this is a roasting technique that requires a wood fire or wood smoke.
Broil
To cook with radiant heat from above. A rapid, high-heat cooking method used mainly for tender meats, poultry, fish, and a few vegetable items.