Pour 1/2 cup Wish-Bone® Italian Dressing over turkey in large, shallow nonaluminum baking dish or plastic bag. Cover, or close bag, and marinate in refrigerator, turning occasionally, 30 minutes to 3 hours.
Remove turkey from marinade, discarding marinade. Grill or broil turkey, turning once and basting with remaining 1/4 cup Dressing, 30 minutes or until turkey is thoroughly cooked. Remove turkey from grill; cover and let stand 5 minutes before slicing.