Glazed Corned Beef

1 Corned Beef Brisket (3-4 pounds), trimmed
1 medium Onion, sliced
1 Celery rid, sliced
1/4 cup Butter or Margarine
1 cup packed Brown Sugar
2/3 cup Ketchup
1/3 cup White Vinegar
2 tablespoon prepared Mustard
2 teaspoons prepared Horseradish


Directions:
   Place corned beef and contents of seasonings packet in a Dutch oven; cover with water. Add onion and celery. Bring to a boil. Reduce heat; cover and simmer for 2-1/2 hours or until meat is tender. Drain and discard liquid and vegetables. Place beef on a rack in a shallow roasting pan; set aside.
    In a saucepan, melt the butter over medium heat. Stir in the remaining ingredients. Cook and stir until sugar is dissolved. Brush over beef. Bake, uncovered, at 350° for 25 minutes. Let stand for 10 minutes before slicing.
Yield: 12 servings