Barbecued Beef Brisket

Ingredients:

3 ½ lb beef brisket.
5 carrots, peeled and cut into one-inch chunks
5 medium red potatoes, unpeeled, quartered
3 medium onions, sliced
1 cup of ketchup
1 cup of water
2 tablespoons of onion, minced
2 tablespoons of cider vinegar
1 tablespoon of horseradish
1 tablespoon of mustard
Salt and pepper

Directions:

In small bowl combine ketchup, water, minced onion, cider vinegar, horseradish, mustard and pepper.
Place beef brisket in a shallow glass baking dish. Pour marinade over beef, and top with sliced onions. Cover and refrigerate overnight to marinate.
Preheat oven to 375 degrees F (190 degrees C). Bring brisket to room temperature and bake, covered, for 3 hours.
Add carrots and red potatoes to baking dish. Baste beef brisket with juices. Cover and continue baking 1 hour more or until beef and vegetables are tender.