Cut a head of cabbage into 8 wedges. Place one wedge on a large piece of foil that has been sprayed with cooking spray. If desired, add slices of onion and carrot. Sprinkle on 2 T. Water, Vinegar, Apple Juice or other liquid. Wrap foil packet to totally enclose cabbage and prevent any liquid from draining out. Place on grill over low coals for 45 minutes to an hour.