Atún encebollado, or tuna with onions, is a traditional dish from the Malaga region. It is made by marinating fresh tuna steaks in a mixture of olive oil, vinegar, onions, and spices, then grilling or pan-searing them until they are cooked to perfection. The result is tender and flavorful tuna with a tangy and sweet onion sauce. Atún encebollado is a popular choice among seafood enthusiasts in Malaga.