In a small bowl, stir together allspice, salt, and pepper. Sprinkle evenly over chops; rub in with your fingers. Place chops on the rack of an uncovered grill directly over medium coals. Grill until desired doneness, turning once halfway through grilling. Allow 12 to 14 minutes for medium-rare doneness (145°F) or 15 to 17 minutes for medium doneness (160°F).