Callipo Riserva Oro - Tuna slices in olive oil (g. 160x2) To produce Tuna in Riserva Oro olive oil, for over 100 years Callipo has chosen the highest quality tuna and processes it completely in Italy (in the Maierato plant) in all its phases, following a centuries-old tradition. After steaming the tuna, the best fillets are chosen one by one, which are still jared by hand, following strict hygiene and food safety rules. A long seasoning follows, which guarantees that intense and inimitable flavor.