Atún encebollado, or tuna with onions, is a traditional dish in Sancti Petri and the surrounding coastal areas. It features fresh tuna steak cooked with onions, garlic, tomatoes, and a variety of spices. The result is a flavorful and tender tuna dish with a hint of sweetness from the caramelized onions. Atún encebollado is often served with crusty bread or rice, allowing you to soak up all the delicious juices. If you are a fan of seafood, this dish is a must-try when visiting Sancti Petri.