Found on menus all over Spain, you are in for a surprise if you expect this tortilla to be wrapped around beans and cheese. A fritatta of fried potatoes and sometimes onion, the ingredients are kept simple, but the flavor is rich and comforting. In Northern Spain, this dish is preferred with a center that’s is still quite soft and even a little runny. Tortilla can be served hot or cold, and the potatoes may be thinly sliced to the point of dissolving or look like a chunky mosaic suspended by yellow walls of egg. On occasion you can find more creative tortillas with stuffings like cheese, sausage, cod or vegetables. Try just a pincho (small slice) or order a tortilla entera (whole) to share among friends.