Cooking also known as cookery is a technology, science, art and craft of preparing food for the purpose of consumption. The techniques and ingredients used for cooking vary widely across the world, from grilling food over an open fire to the use of electric stoves, to baking food in various types of oven, reflecting unique economic, environmental and cultural trends and traditions. The type of cooking also depend on the training and skill level of the cooks. The job of cooking is done by both professionals chefs and cooks in restaurants and other food establishments and people in their own dwellings to feed themselves. The process of cooking can also be accomplished by using chemical reactions without the presence of heat, one of the examples for the same is ceviche. It is a traditional South American dish, where fish is cooked with acids in lime juice or lemon juice.
The preparation of food with fire or heat is an activity unique to humans. This activity is said to have started around 2 million years ago, even though archeological reference for it reaches no more than 1 million years ago.
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