Spanish Tuna-Stuffed Piquillo Peppers are a delicious and flavorful appetizer or tapas dish. Piquillo peppers, a type of sweet and slightly spicy red pepper from Spain, are stuffed with a mixture of tuna, onions, garlic, and spices. The peppers are then baked until tender and the filling is heated through. These stuffed peppers are perfect for entertaining or as a light and tasty snack. Serve them warm or at room temperature for a delightful burst of flavors.