Mexican sandwiches are also known as tortas or jalapeño Poppers. These are typically made with a warm corn tortilla, filled with a variety of ingredients such as shredded meat, cheese, beans, lettuce, tomatoes, onion, salsa, avocado and sometimes jalapeño peppers. Popular meats used in Mexican sandwiches are carne asada, carnitas and al pastor. You can find many variations of Mexican sandwiches across different regions of Mexico and in Mexican-American cuisine.