Ingredients:

  Amount  Measure       Ingredient -- Preparation Method
--------  ------------  --------------------------------
   3      Pounds        beef round steak -- 1/2 inch thick
     1/2  Cup           flour
   2      Teaspoons     salt
     1/8  Teaspoon      pepper
     1/2  Teaspoon      dry mustard
   2      Medium        onions -- thinly sliced &
                         -- separated in rings
   2      Cans          (4 oz. each) sliced mushrooms or -- drained
     1/2  Pound         mushrooms -- sliced
   1      Can           (10 1/2 oz.) condensed beef broth
     1/4  Cup           dry white wine -- (optional)
   1 1/2  cups          sour cream
     1/4  cup           flour

Preparation:

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.