Beef stroganoff

1.Dust beef with flour and season with salt and pepper.

2.In a frying pan, melt butter on high. Cook onion 5 minutes, stirring, until soft. Remove and set aside. Add beef and cook 3 minutes, stirring. Return onion to pan with mushrooms and cook another minute. Add tomato paste and sour cream. Reduce heat and cook 1-2 minutes, until heated through.

3.Meanwhile, prepare rice according to packet directions. Serve beef with rice.