Beef Stroganoff - cooking recipe

Ingredients

1 lb. good steak, thinly sliced
1 1/2 tsp. salt
2 tsp. pepper
8 Tbsp. butter
3 Tbsp. flour
1 c. beef broth
1 tsp. mustard
1 large onion, thinly sliced
1/2 lb. mushrooms, sliced
1 c. sour cream

Preparation

Lay the sliced steak between sheets of waxed paper.
Season with salt and pepper; roll up and set aside for 2 hours at room temperature.
In a saucepan, melt 3 tablespoons butter.
Stir in flour and cook, stirring, for 15 seconds.
Add mustard and broth; stir until thickened and set aside.