Instructions: Combine soy sauce, sherry, ginger, sugar and garlic; mix well. Pour over sirloin chunks and marinate at least 4 hours. Drain beef and reserve marinade. Saute onions and mushrooms in butter; remove from pan (reserving liquid); set aside. In same pan saute beef for 2-3 minutes (rare beef). Remove from pan and keep warm. Add water to reserved marinade to make one cup. In another saute pan, stir flour into 1 tablespoon of the reserved onion-mushroom liquid and gradually add the one cup of marinade. Cook until thickened. Add beef, onions, mushrooms, salt, pepper and sour cream (do not boil). Add parsley and serve over hot buttered noodles.

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