Callipo Riserva Oro - Tuna Fillets with Extra Virgin Olive Oil - Organic Oil (150 g glass) To produce Riserva Oro Tuna Fillets, with extra virgin olive oil (organic oil), for over 100 years Callipo has chosen the finest quality tuna and processes it completely in Italy (in 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.