A burrito is a type of Mexican-American food. It consists of a wheat flour tortilla wrapped or folded into a cylindrical shape to completely enclose the filling. (In contrast, a taco is generally formed by simply folding a tortilla in half around a filling, leaving the semicircular perimeter open.) The flour tortilla is usually lightly grilled or steamed, to soften it and make it more pliable. In Mexico, meat and refried beans are sometimes the only fillings. In the United States, burrito fillings generally include a combination of ingredients such as Mexican-style rice or plain rice, refried beans or beans, lettuce, salsa, meat, guacamole, cheese, and sour cream, and the size varies. Typically, American-style burritos are stuffed with more ingredients than the primary meat and/or vegetable filling.