Barbecue, for example, can be accomplished in two ways: grilling and roasting. Grilling is a method of cooking food over direct heat, usually on a metal grate over an open flame. Roasting is a method of cooking food in an oven or over an open flame, usually with the addition of fat or oil to help keep the food moist. Both methods are popular for outdoor cooking, such as barbecues, and can be used to cook a variety of meats, vegetables, and other foods.