Sauerbraten with stalks

4 pounds beef roast sirloin tip, rump, round bone chuck, preferably boneless 1 1/2 cup vinegar 1 cup cola * 3/4 cups water 3 each onions sliced 2 each celery[...]

3 1/3 lbs rolled beef brisket 1 tablespoon salt 1/2 teaspoon pepper 2 onions , sliced 1 carrot , sliced 1 stalk celery , chopped 4 cloves 4 peppercorns 2 cups[...]