As long as tuna boats have plied the seas, ventresca, the belly of the tuna, has been highly prized by connoisseurs as the tastiest and most tender part of the entire tuna. After each Bonito del Norte tuna is cooked in sea water, the delicate ventresca fillets are placed in a tin, always by hand. The ventresca is then covered in olive oil, thereby keeping it moist and enhancing its delicate flavor.