Mediterranean Tuna Wrap

Name: Mediterranean Tuna Wrap
Ingredients: 2 (6-ounce) cans chunk light tuna in water, drained well; 1/4 cup finely diced red onion; 1/4 cup chopped fresh parsley leaves; 1/4 cup chopped calamata olives; 3 tablespoons olive oil; 1/2 teaspoon lemon zest; 2 tablespoons freshly squeezed lemon juice; Salt; Freshly ground black pepper; 6 cups pre-washed mixed greens (about 3 ounces); 4 whole-grain wrap breads (about 2 ounces each); 2 large tomatoes, sliced