pairs, and also include salsa, onion, and cilantro (coriander leaf) with occasional use of guacamole. Tacos de camarones ("shrimp tacos") also originated in Baja California in Mexico. Grilled or fried shrimp are used, usually with the same accompaniments as fish tacos: lettuce or cabbage, pico de gallo, avocado and a sour cream or citrus/mayonnaise sauce, all placed on top of a corn or flour tortilla. Tacos de cazo (literally "bucket tacos") for which a metal bowl filled with lard is typically used as a deep-fryer. Meats for these types of tacos typically include Tripa ("tripe", usually from a pig instead of a cow, and can also refer to the intestines); Suadero (tender beef cuts), Carnitas and Buche (Literally, "crop", as in bird's crop; or the esophagus of any animal.) Tacos de lengua (beef tongue tacos), which are cooked in water with onions, garlic, and bay leaves for several hours until tender and soft, then sliced and sautéed in a small amount of oil. "It is said that unless a taquería offers tacos de lengua, it is not a real taquería." Tacos de pescado ("fish tacos") originated in Baja California in Mexico, where they consist of grilled or fried fish, lettuce or cabbage, pico de gallo, and a sour cream or citrus/mayonnaise sauce, all placed on top of a corn or flour tortilla. In the United States, they were first popularized by the Rubio's fast-food chain, and remain most popular in California, Colorado, and Washington. In California, they are often found at street vendors, and a regional variation is to serve them with cabbage and coleslaw dressing on top. Tacos dorados (fried tacos; literally, "golden tacos") called flautas ("flute", because of the shape), or taquitos, for which the tortillas are filled with pre-cooked shredded chicken, beef or barbacoa, rolled into an elongated cylinder and deep-fried until crisp. They are sometimes cooked in a microwave oven or broiled. Tacos sudados ("sweaty tacos") are made by filling soft tortillas with a spicy meat mixture, then placing them in a basket covered with cloth. The covering keeps the tacos warm and traps steam ("sweat") which softens them. As an accompaniment to tacos, many taco stands will serve whole or sliced red radishes, lime slices, salt, pickled or grilled chilis (hot peppers), and occasionally cucumber slices, or grilled cambray onions. Non-traditional variations Hard-shell tacos The hard-shell or crispy taco is a tradition that developed in