Tripas
Tripas, in Mexican cuisine (known as chitterlings in English-speaking countries), are the small intestines of farm animals that have been cleaned, boiled and grilled. "Tripas" are used as filling for tacos, and then dressed with condiments such as cilantro, chopped onions, and chile sauce. They are also served with "pico de gallo" and "guacamole". Preparation. Tripas as prepared Mexican style require care by the cook, to avoid becoming rubbery. They are traditionally cooked in a ""Disco"" which is constructed of two tilling discs (commonly used in the farming industry) welded to an iron pole in the center of  the discs to form a wok like bowl on top of the pole with another disc about below it. The "tripas" are placed in the top disc and filled with water while the lower disc is filled with wood or charcoal, thus creating the heat to cook. The "tripas" are boiled for several hours until tender, adding water as needed. Once they are tender the cook will allow the water to boil off and then finish the preparation by continuing to let them cook in their own fat. Tripas are prepared in three levels: Portuguese tripas. "Tripas" or "dobrada" in  Portuguese cuisine is beef stomach, and in the form of "tripas à moda do Porto" (tripes Porto style, with white beans, rice and carrots) is considered the traditional dish of the city of Porto, whose inhabitants are informally known as "tripeiros". It is a typical and usual dish across many different regions of Portugal and is most widely known outside Porto as dobrada.