Beef Stroganoff

1 lb round steak
2/3 C water
3 oz canned mushrooms
1 envelope onion soup mix
1 C sour cream
2 T flour
egg noodles, cooked and drained

Cut meat into thin strips; brown in shortening.  Add water and mushrooms.  Stir in onion soup mix; heat to boiling.  Blend sour cream and flour, and add to hot mixture.  Let thicken.
Serve over noodles

To make ahead, prepare completely; let cool and freeze.  On serving day, make fresh noodles and heat sauce.  Sauce will separate somewhat, but vigorous stirring brings it right back.