1. Combine first 5 ingredients; stir well.
2. Prepare grill.
3. Trim fat from chops. Coat grill rack with cooking spray; place on grill over medium-hot coals (350° to 400°). Place chops on rack; grill, covered, 6 minutes on each side or until desired degree of doneness, basting occasionally with vinegar mixture. Serve with balsamic vinegar, if desired.