2 lbs. lean sirloin steak
3 tbsp. sweet butter
2 medium to lg. onions, sliced thin
1 lb. mushrooms, sliced
1 tbsp. flour
1/4 tsp. white pepper
1/2 tsp. paprika
Dash of cayenne pepper
Salt to taste
1 c. sour cream

With sharp knife, cut beef across grain into narrow strips. Heat 2 tablespoons of butter in large heavy skillet and add meat and onions. Cook over high heat, turning meat to brown all sides a few minutes. Reduce heat; add mushrooms and cook, covered, for 10 minutes more. Remove mixture to top of double boiler and place over boiling water to keep hot. To juices in skillet, add remaining butter and blend in flour and seasonings. Gradually add sour cream, blending to keep smooth. Add meat mixture and heat, if necessary. Serve with noodles and a sprinkling of chives. (Rice or potatoes are also good accompaniments.) Serves 6.