The olive oil is embedded in the tuna, making its texture even softer and enhancing its taste. Just one of these fillets on top of crunchy toast is a delicious combination. Santa Catarina is located in the island of São Jorge, which is part of the Azores Portuguese archipelago found right in the middle of the North Atlantic cold waters. The waters here are among the purest in the world, meaning the fish avoid metal contamination. At the shore, men in small boats have been catching skipjack tuna for generations during their migration period along the islands. Balance and sustainability are assured and only the pole & line method is used.