Preheat Broiler. Brush Pork Chops With Vegetable Oil And Season With Salt And Pepper To Taste. Broil For 6 To 7 Minutes On Each Side. While Chops Are Broiling, Heat Butter In A Heavy Skillet. Add Apple And Onion And Saute For About 10 Minutes. Add Applejack And Bring To A Boil. Scrap Brown Particles From Bottom And Sides Of Pan. Whisk In Mustard And Chicken Stock. Boil Sauce For 3 Minutes. It Should Thicken Slightly. Add Pork Chops To Pan And Coat With Sauce. Cook 3 Minutes Longer.