Mix all of above ingredients and set aside. Melt 3-4 Tbsp. fat in a heavy skillet, add 1 medium onion, chopped. Trim excess fat from 6 pork chops, wipe with a damp cloth.
Coarsely crush peppercorns. Paint steaks liberally with mustard. Cover steaks with peppercorns. Place on HOT grill to sear. Paint backside. Cover with peppercorns. Turn over to sear.