True Beef Stroganoff
["3 lb. round steak", "1 Tbsp. butter", "1/4 c. onion", "1/2 lb. mushrooms", "8 Tbsp. flour", "8 Tbsp. water", "8 Tbsp. catsup", "1 tsp. mustard", "1 tsp. Worcestershire sauce", "1 tsp. horseradish", "2 beef bouillon cubes", "1 c. boiling water", "1/4 to 1/2 c. sour cream"]
["Trim fat from steak; cut into bite size pieces.", "Brown meat, onions and mushrooms in butter."]
["butter", "onion", "mushrooms", "flour", "water", "catsup", "mustard", "Worcestershire sauce", "horseradish", "boiling water", "sour cream"]