Remove meat and mushrooms from pan.Add 2-tablespoons butter or margarine to the pan drippings;blend in 3 tablespoons of all purpose flour.Add 1-tablespoon tomato paste.Stir in 1-1/4 cups of cold beef stock or bouillon.Cook and stir over medium-high heat until thickened and bubbly.
Return meat and mushrooms to skillet.Stir in 1-cup of sour cream:cook slowly until heated.DO NOT BOIL.Serve over hot egg noodles. Makes 4-5 servings.
