Rub the outside of the tuna thoroughly with the creamy balsamic vinaigrette and allow to marinate 2-3 hours.
Prepare the grill. Place woodchips over the coals to create a heavy smoke. Cook tuna over direct medium heat, until tuna reaches medium-medium well, approximately 8-10 minutes. Remove tuna and allow to cool completely. Once cooled, dice into 1-inch cubes.
Following the directions on the package of rotini, cook the pasta. Once cooked, drain well and rinse thoroughly with cool water. Drain completely.=
Place the pasta in a large mixing bowl. Add all of the remaining ingredients and the tuna and mix well.
Chill for 2-3 hours before serving.
Yield: 6 servings