Both types of fish drained of oil. Tuna is pressed. Set aside 6 olives and other stones are removed and crushed in a mortar, add to the fish. With wooden spoon stir the margarine and add to the fish mixture. And add the lemon juice, salt, pepper and some chopped parsley. Stir the mixture well and fill pre hollowed tomatoes. Arrange the tomatoes on a plate. On each tomato cross from anchovy fillets and put on one olive. Between tomatoes put sprigs of parsley and lemon slices.