Hola!, an omelet is a dish made from beaten eggs fried with butter or oil in a frying pan. It is quite common for the omelet to be folded around a filling such as cheese, vegetables, meat, or some combination of the above. Whole eggs or sometimes only egg whites are beaten with a small amount of milk, cream, or even water. Spanish omelet is the English name for a traditional dish from Spanish cuisine called tortilla española, tortilla de patatas or tortilla de papas. It is an omelet made with eggs and potatoes, sometimes also with onion and/or chives garlic; fried in oil and often served cold as an appetizer. It is part of the cuisine of Spain and many South American countries, especially those in the area of the Rio de la Plata.