In a Dutch oven, brown roast in hot oil. Combine water, beer, tomato sauce, onion, sugar, vinegar, salt, cinnamon, bay leaf, pepper and ginger. Pour over meat and bring to a boil. Reduce heat; cover and simmer until meat is tender, 2-1/2-3 hours., Remove meat. Discard bay leaf. If desired, thicken juices with cornstarch and water. Freeze option: Place sliced pot roast in freezer containers; top with cooking juices. Cool and freeze. To use, partially thaw in refrigerator overnight. Microwave, covered, on high in a microwave-safe dish until heated through, gently stirring and adding a little broth if necessary.