Place the brisket and marinade in a resealable plastic bag and rotate the bag several times to throughly coat the meat. Marinate at least 3 hours in the refrigerator. Preheat the oven to 250 degrees. Place the brisket and marinade ina roasting pan and cover tightly with foil. Bake for 3 to 4 hours or until tender. Be sure to serve it with the pan drippings.