Beef Stroganoff

CROCK POT BEEF STROGANOFF
3 lb. beef round steak, 1/2 inch thick 1/2 c. flour 2 tsp. salt 1/8 tsp. pepper 1/2 tsp. dry mustard 2 med. onions, thinly sliced and separated into rings 2 (4 oz. each) cans sliced mushrooms, drained or 1/2 lb. mushrooms, sliced 1 (10 1/2 oz.) can condensed beef broth 1/4 c. dry white wine (optional) 1 1/2 c. sour cream 1/4 c. flour 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 8-10 hours. Before serving, combine sour cream with 1/4 cup flour; stir into crock pot. Serve stroganoff over rice or noodles.