Mix turkey, dressing and onion (about 1/3 cup dressing and 2 tablespoons onion for each pound of turkey). Shape into patties, about 1 inch thick. Heat coals or gas grill for direct heat. Cover and grill patties 4 to 6 inches from medium heat 14 to 16 minutes, turning once, until no longer pink in center. Serve on buns.
