Spanish omelette

Spanish omelette or Spanish tortilla is a traditional dish from Spain. It is celebrated as one of the most popular dishes of the Spanish cuisine. It is an omelette made with eggs and potatoes, usually including onion. It is often served at room temperature as a tapa. It is commonly known in Spanish-speaking countries as tortilla de patatas, tortilla de papas, or tortilla española. The first reference to the tortilla in Spanish is found in a Navarrese document, as an anonymous "mousehole memorial" addressed to the court of Navarre in 1817. It explains the sparse conditions of Navarre's farmers in contrast with those in Pamplona and la Ribera (in southern Navarre). After listing the sparse food eaten by highlanders, the next quote follows: "…two to three eggs in tortilla for 5 or 6 [people] as our women know how to make it big and thick with fewer eggs, mixing potatoes, breadcrumbs or whatever."

Source: Wikipedia