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