Beef Stroganoff - cooking recipe

Ingredients

3 Tbsp. butter
1/2 lb. mushrooms*
1 large onion, cut into 1/2-inch slices
1 1/2 to 2 lb. flank or round steak
1 Tbsp. bottled horseradish
1/2 c. water
1 tsp. Worcestershire sauce (condiment sauce)
1 1/4 tsp. salt
1/8 tsp. pepper
1 c. sour cream

Preparation

*Two 4 ounce cans may be used.