Eat them for breakfast, lunch, dinner or at snack time. In Mexico, tacos are simply a wrapper, usually corn but sometimes a flour tortilla, wrapped around small bits of food, often meats, topped with fresh onion, cilantro and a little sauce Learn all about Mexican tacos including taco history, 7 traditional taco styles and basic ingredients.In Mexico, tacos are simply a wrapper, usually corn but sometimes a flour tortilla, wrapped around small bits of food, often meats, topped with fresh onion, cilantro and a little sauce. In the U.S. a taco is more likely a u-shaped corn tortilla (sometimes per-baked) filled with ground meat, lettuce, cheese, topped with some sort of sauce. No matter how you define this dish, tacos have made their way into main stream American cuisine.