In a small bowl combine pineapple, honey and dijon mustard; reserve 1/2 cup of marinade. Cover and refrigerate reserved marinade. Pour remaining marinade in a large resealable bag. Sprinkle pork chops with salt and pepper and add to the bag with pineapple marinade. Marinate for 4-24 hours.
Remove from marinade and cook over medium-high heat on greased grill until brown and no longer pink in the middle. For pork chops that are thicker than 3/4" grill 6-7 minutes per side. For chops that are 3/4" or thinner grill for 5-6 minutes per side or until cooked through. Brush on reserved marinade a few times during grilling.