Ingredients:

  Amount  Measure       Ingredient -- Preparation Method
--------  ------------  --------------------------------
   4      medium        Tomatoes
   2      tablespoon    Oil
   2      pound         Flank steak
   1      medium        Green pepper -- sliced
   3      tablespoon    Soy sauce
   1      medium        Onion -- sliced
   2      tablespoon    Dry sherry
   1                    Beef bouillon cube
  10      milliliter    Garlic -- minced
     3/4  cup           Boiling water
     1/2  teaspoon      Ground ginger
   2      tablespoon    Cornstarch
     1/8  teaspoon      Ground black pepper
   2      tablespoon    Cold water

Preparation:

Thinly slice beef on the diagonal (for easy slicing,place meat in the freezer until slightly frozen);place in a snug-fitting bowl. Combine soy sauce,sherry,garlic,and black pepper;pour over meat,tossing to coat completely.Cover and refrigerate 8 to 10 hours. In a large skillet or wok,heat oil. Add green pepper and onion saute for 2 minutes.Dissolve bouillon cube in boiling water. Add beef and marinate.Bring to boiling point.Reduce heat and simmer,covered for 8 minutes.Blend cornstarch with cold water. Stir into mixture in skillet. Cook and stir until thickened.Cut tomatoes into wedges;add to skillet;stir gently. Cover and simmer, just until tomatoes are hot,about 3 minutes.Serve hot over rice with scallions,if desired.