Instructions: Trim all excess fat from steak and cut meat into 3-inch strips about 1/2 inch wide. Combine 1/2 cup flour, the salt, pepper and dry mustard; toss with steak strips to coat thoroughly. Place coated steak strips in crock pot; stir in onion rings and mushrooms.

Add beef broth and wine; stir well. Cover and cook on LOW setting for 8 to 10 hours. Before serving, combine sour cream with 1/4 cup flour; stir into crock pot. Serve stroganoff over rice or noodles.

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