Pour water and tomato juice into a 1 1/2 quart saucepan. Add all but the last 4 . Stir with a whisk thoroughly mixing . Bring to a boil, then reduce heat and simmer 5 minutes. Remove bay leaf; stir in lemon juice. Mix cornstarch with 1 tablespoon water; stir into sauce. Cook, stirring constantly until sauce thickens. Whisk in vegetable oil. Make about 3 cups.