2 lb. sirloin steak, cut into thin strips
2 c. sliced fresh mushrooms
2 med. onions, sliced
2 tbsp. oil
2 cubes beef bouillon
1 c. hot water
1/2 tsp. salt
2 tbsp. tomato paste or catsup
1 tsp. dry or prepared mustard
2 tbsp. flour
1/2 c. water
1/2-1 c. sour cream

In large fry pan, cook steak, mushrooms and onions in hot oil until golden brown. Add bouillon water, salt, tomato paste and mustard. Cover, simmer about 30 minutes or until tender.

Combine flour and water. Stir into meat mixture. Cook, stirring constantly, until mixture comes to boil. Reduce heat. Stir in sour cream. Heat but do not boil. Serve over rice or noodles.