In a large bowl flake tuna with a fork. Stir in capers, black olives, onion and tomatoes. Pour in oil and vinegar and toss to coat. Season and serve with watercress on whole grain bread. Alternative: Arrange mixed greens on plate and top with a quartered boiled new potato, quartered boiled egg and steamed green beans. In center place a scoop of the tuna salad.
Recipe Courtesy of Food Network Kitchens