Slice meat crosswise of grain into think strips, brown in butter; sprinkle with paprika. Add beef broth, cover and simmer 30 minutes.

Stir in onions and green peppers; cook, covered, for 5 minutes.

Blend cornstarch, water and soy sauce; stir into mixture until clear and thick, about 2 minutes.

Add tomatoes and stir gently.

Serve over rice or thin noodles.