2 lb Beef brisket
2 c  Beef broth
1/2 c  Red wine vinegar
1/4 c  Firmly packed brown sugar
3    Garlic cloves, minced
1 c  Chopped onions
1/4 c  Dijon mustard
1/4 c  Soy sauce

Place brisket in 13×9 (3-quart) glass baking dish or large resealable
plastic bag. In medium bowl, combine all remaining ingredients; mix well.
Pour over brisket, turning to coat; cover dish or seal bag. Refrigerate 8
hours or overnight. Heat oven 325F. Drain brisket, reserving marinade.
Place brisket and half of marinade (about 1-3/4 cups) in 13×9 baking dish;
cover. Discard remaining marinade. Bake at 325 for 4 hours or until
tender. 8 servings.

Typically we marinate it overnight and cook for 4 hours (no longer). It is
delicious!