Heat to boiling the night before serving:
1 1/2 cups water
16 ounces tomato sauce
1 medium onion, chopped
3 tablespoons vinegar
3 tablespoons Worcestershire sauce
1 teaspoon salt
1/4 teaspoon chili powder
3 tablespoons granulated sugar
Cut meat into serving pieces and place in a large glass bowl. Use about 6 to 7 pounds meat. Pour marinade over meat. Chill overnight.
Bake, covered, at 450 degrees F for 30 minutes. Reduce heat to 350 degrees F and bake, uncovered, for 1 1/2 to 2 hours. Bake in a single layer in a metal pan. Turn often during the last 1 1/2 to 2 hours baking period.
Serve with salad.