This is my "go-to" grill recipe for company. These chops put a grlled steak to shame! Although this recipe calls for a charcoal grill, I have only made this using a gas grill, and they turn out wonderfully each time.
Trim any fat from meat. Place pork chops in a plastic bag set into a deep bowl. In bowl, combine onion, soy sauce, oil, ketchup and garlic. Pour over pork chops in bag. Close bag. Marinate pork loin chops in the refrigerator for 4 to 6 hours, or overnight, turning the bag occasionally.
Remove pork chops from marinade. Sprinkle with some pepper.
Grill the marinated chops on grill rack of an uncovered grill over hot coals for 2 to 4 minutes per side.
Stand the pork chops on end, bone side down. (To do this, you may use a metal skewer placed through the center of the chops while they are bone side down).Lower grill hood and cover directly over hot coals for 25 to 35 minutes or till juices run clear (a meat thermometer inserted in the center of the chops should read 160 degrees).