A delicious but rather unusual combination of ingredients makes this a very interesting dish. I used shredded zucchine, leek, mackerel in olive oil, a clove of garlic and lemon juice. I also added a little fresh red Cayen pepper and a sprinkle of black pepper for a livelier flavor and that was it. A very enjoyable dish that is usually made with canned tuna but other types of sea food items can be substituted as one's fancy dictates.