In a medium bowl combine the tuna, onion, parsley, olives.
In a small bowl, whisk together the olive oil, zest, lemon juice, salt and pepper. Pour about 2/3 the dressing over the tuna mixture and toss to combine. In a separate bowl, pour the rest of the dressing over the greens and toss to combine.
Place some tuna salad onto each piece of wrap bread. Top with 1 1/2 cups of greens and a few tomato slices. Roll the wraps and serve.
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