Step 1

Mix mustard, brown sugar, apple juice, and Worcestershire sauce together in a bowl until marinade is smooth. Pour 2/3 the marinade into a large resealable plastic bag. Add pork chops, coat with marinade, squeeze out excess air, and seal the bag. Marinate in the refrigerator for 8 hours to overnight. Cover bowl with remaining marinade with plastic wrap and refrigerate.

Step 2

Remove pork chops from marinade and discard bag and marinade.

Step 3

Preheat grill for medium heat and lightly oil the grate.

Step 4

Cook the pork chops on the preheated grill, basting with reserved marinade, until no longer pink in the center, 4 to 5 minutes per side. An instant-read thermometer inserted into the center should read 145 degrees F (63 degrees C). Let pork chops stand for 5 minutes before serving.