Flank Steak In Mushroom Sauce

1 flank steak -- (1 to 1 1/2 lb.)

1/4 cup Sauterne wine

1 tablespoon Soy sauce

1 Clove garlic -- minced

1 can beef broth -- (10 1/2 oz.)

1 tablespoon Catsup

1 teaspoon Prepared mustard

1 tablespoon Instant minced onion

2 tablespoons Cornstarch

2 tablespoons Water

1/4 pound Fresh mushrooms -- sliced

Place steak in crockpot. Combine wine, soy sauce, garlic, broth, catsup, mustard and onion; pour over steak. Cover and cook on low for 6 to 8 hours. Dissolve cornstarch in water; stir into pot. Add mushrooms. Turn to high; cover and cook on high 20 to 30 minutes. From Crockery Cookery by Mable Hoffman.