Ajo harina is a traditional dish originating from Jaén. Although there are many variations, the simplest recipe for the dish calls for a combination of potatoes, flour, garlic, bell peppers, paprika, olive oil, salt, and black pepper. The potatoes are peeled, sliced, and fried in olive oil with bell pepper strips.

The mixture is covered with water. Next, mashed garlic, paprika, flour, salt, and pepper are all added into the pan. The dish is cooked until the potatoes become soft, and ajo harina is then served immediately, while still hot. In different regions of Spain, additional ingredients are added for extra flavor, such as mushrooms, onions, longaniza sausage, or pieces of cod.