For a charcoal grill, arrange medium-hot coals around a drip pan. Test for medium heat above drip pan. Place chops on the grill rack over drip pan. Cover and grill for 30 to 35 minutes or until done (160 degree F), adding the orange halves, cut sides down, directly over the coals the last 5 minutes of grilling, or until oranges are heated through. (For a gas grill, preheat grill. Reduce heat to medium. Adjust for indirect cooking. Cover and grill as above.)