A recipe from “Berømte Retter” (Famous Dishes) published by Ernst G Mortensen in 1970
There is no more genuine Spanish dish than tortilla, and it is made in numerous varieties throughout Spain. Spaniards tend to say that the French got their omelette through the Spanish chef to Louis XIV ‘s Spanish consort. Tortilla crossed the Atlantic with the Spanish conquistadores, but the dish has to some extent changed character on the other side of the ocean. The Mexican tortilla has nothing in common with an omelette. It is a small pancake made with flour (corn-starch) eaten with spicy filling or sauce.