Instructions

  1. Place beef in heavy large pot. Stud each onion with 4 cloves. Add to pot with carrots, celery, garlic and peppercorns. Cover with water. Bring to boil over medium heat. Reduce heat, cover and simmer until beef is tender, about 3-1/4 hours, turning beef every hour. (Can be prepared 1 day ahead. Refrigerate beef in cooking liquid. Bring to room temperature before baking.).
  2. For sauce: combine first 11 ingredients in heavy medium saucepan over medium-low heat. Stir until jelly ismelted. Let cool at least 30 minutes. (Can be prepared 1 day ahead.).
  3. Position rack in center of oven and preheat to 350 degrees. Drain beef and pat dry. Arrange fat side up in large roasting pan. Cut off any excess fat and discard. Spread coarse-grained mustard over beef. Pour 2-1/2 cups sauce over beef. Sprinkle with sugar. Bake until beef is glazed deep rich brown, basting every 15 minutes, about 45 minutes.
  4. Transfer to large platter. Spoon some of sauce over top. Serve immediately, passing remaining sauce separately.