Mesquite Grilled Pork Chops with Sweet Onion

1 package (1.1 oz) mesquite marinade mix for the grill
2/3 cup water
2 tablespoons vegetable oil
4 bone-in or boneless pork chops (1/2 inch thick)
1 large sweet onion, cut into 1/4-inch-thick slices

In large shallow dish or resealable food-storage plastic bag, mix marinade mix, water and oil.

Add pork chops and onion; turn to coat. Cover dish or seal bag; refrigerate 30 minutes to marinate.

Heat gas or charcoal grill.

When grill is heated, remove pork and onion from marinade; reserve marinade. Place pork and onion on gas grill over medium heat or on charcoal grill over medium coals; cover grill. Cook 10 to 15 minutes, turning once and brushing frequently with marinade, until pork is no longer pink in center. Discard any remaining marinade.