Place the tongue in a roasting pan with the onions around it. Sprinkle with the salt, pepper and garlic powder. Add the bay leaf, tomato sauce, tomatoes and water. Cover the pan and roast in a 325 degree oven 3 hours or until the tongue is tender. Baste frequently and remove the cover for the last 30 minutes. Discard the bay leaf.
Serves 6 to 8.