The heat for cooking can be made in different ways. It can be from an open fire that burns wood or charcoal. It can be on a stove or in an oven that uses propane, natural gas, or electricity. There are several different ways to cook food. Boiling cooks food in hot water. Frying (deep or shallow) cooks food in hot butter, fat or oil. Baking and roasting cook food by surrounding it with hot air. Grilling means cooking food on a metal grill that has heat under it. People often cook meat by boiling, roasting, frying, or grilling it. Some foods such as bread or pastries are usually baked.