To a native Californian like myself, a "tortilla" is round and flat, and comes in only two styles, flour and corn. So the concept that a tortilla could also be a thick potato omelette, took some getting used to. But that is the difference between a Spanish tortilla and a Mexican tortilla. The Spanish version is made by frying thinly sliced potatoes in olive oil, then layering those slices in a pan (preferably a cast iron frying pan), covering with beaten eggs, and cooking until set. It's perfect for a weeknight meal, and only requires a few ingredients which you likely have in your pantry. It's good warm, room temperature, or cold, and makes for great leftovers. - Bonnie Foster