Wherever we go, the local cuisine always seems to have a go-to item—something easily ordered, quick to prepare, widely available, and nearly foolproof. In much of the U.S., that's often a hamburger. In France, a slice of quiche and a salad. In Spain, it's the potato omelet, or tortilla española. You never know where you'll get a great tortilla. The lowliest dive bar serves tortilla and bars attached to fancy restaurants offer it. You can even get a decent one in the refrigerator cases in many supermarkets. The tortilla can be the model of simplicity—a magical amalgam of eggs, potato, onion, and olive oil. That's the first image on the right, shown with tomato-rubbed bread in La Gardunya at the back of La Boqueria market...Read More