2 lb. sirloin steak
2 c. fresh mushrooms, sliced
2 med. onions, sliced
2 tbsp. tomato paste or ketchup
1 tsp. dry or prepared mustard
1/2 to 1 c. sour cream
2 tbsp. oil or shortening
3 beef bouillon cubes
1 c. hot water (or use 1/2 c. red wine and 1/2 c. hot water)
1/2 tsp. salt
2 tbsp. flour
1/2 c. cold water

Cut steak into thin strips. In large fry pan, saute steak, onions, and mushrooms in hot oil until golden brown. Add bouillon cubes, hot water (or red wine and hot water), salt, tomato paste (or ketchup), and mustard. Cover and simmer 30-45 minutes or until meat is tender.

Combine flour and cold water. Slowly stir into meat mixture. Cook stirring constantly until mixture comes to a boil. Reduce heat. Stir in sour cream. Heat, BUT DO NOT BOIL! Serve over or with rice or buttered noodles.