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1 pound boneless, lean beef, cut into strips
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1 tablespoon chopped fresh ginger (optional)
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1/2 cup chopped scallions
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1 red bell pepper, cored, seeded, and cut into strips
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1/2 cup very thinly sliced carrots
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1 1/2 cups sliced mushrooms
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1 cup drained bamboo shoots
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3 tablespoons oyster sauce or black bean sauce
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2 teaspoons soy sauce, or more to taste
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