Several hours before cooking meat, cut orange in half. Rub juice on each rack of ribs. Allow to marinate until cooking time.
Combine all other ingredients. Bring to simmer in a small saucepan.
Simmer for 2 minutes. Remove from heat. Set aside to cool.
Prepare barbecue coals. When ready brush ribs with sauce. Grill 35 - 45 minutes in all, Start ribs rounded-side up; turning ribs every 10 minutes.
Brush with sauce frequently. When cooked through, and sides are crisp and glazed, remove from fire. Serve one rack per person.
Servings: