Ingredients

  • 2 lb. lean sirloin steak (1/2 x 2-inch thick slices)
  • 2 tsp. salt
  • 1/2 tsp. fresh ground pepper
  • 4 Tbsp. butter
  • 1 medium onion, thinly sliced
  • 1 Tbsp. flour
  • 1 tsp. mustard powder or 1 Tbsp. Dijon-type, prepared
  • 1/2 c. dry white wine
  • 2 tsp. tomato paste
  • 1 Tbsp. minced onion
  • 1/2 lb. mushrooms, thinly sliced
  • 2 Tbsp. dry white wine
  • 1 c. sour cream, preferably warm

Method

  • Pound meat between sheets of wax paper with a mallet. Sprinkle with salt and pepper and let stand 15 minutes.
  • Heat 2 tablespoons butter in deep frypan.
  • Add onion and cook over medium heat; stir constantly for about 5 minutes or until softened.
  • Stir in flour and mustard and cook for 1 minute, stirring constantly. Reduce heat to low, cover pan and simmer for 5 to 10 minutes, stirring frequently.