Onion tuna is a tasty and nutritious culinary option. This dish takes advantage of the properties of blue fish, known for its unsaturated fats, considered healthy. Its main ingredients are tuna (50%), onion (43%), white wine (4%), garlic (1%), extra virgin olive oil (1%), and salt (0.85%). This combination offers enhanced flavor and a pleasant texture. Onion tuna has a net weight of 300 grams, making it perfect for sharing or enjoying at a meal. To ensure its freshness, it is recommended to keep it refrigerated at a temperature of 4ºC or lower. This dish is ideal for those who want to combine flavor and health in one bite.