Cut zucchini in half, scoop out flesh, cut in half again for a total of 4 boats.
Bake zucchini for 20 minutes or until it's tender.
Fill zucchini boats with 1/4 cup or so of the tuna salad.
Sprinkle 2 tablespoons of shredded cheese on each boat and then broil for 1-2 minutes or until the cheese is melted.
Notes
Sugar: 3 Make ahead instructionsThe tuna salad can be made up to 3 days ahead of time. Continue with instructions when ready to prepare the zucchini boats.