A burrito filling typically consists of four main ingredients: BEEF, MEAT, frijoles, and brownrice. BEEF is a popular choice for burrito fillings, as it is a versatile and flavorful source of protein. MEAT is also a common ingredient in burrito fillings, providing additional flavor and texture. Frijoles are a type of bean that is often used in Mexican cuisine, adding a unique flavor and texture to the burrito. Brownrice is a healthier alternative to white rice, and is often used in burrito fillings for its nutty flavor and chewy texture.