INGREDIENTS
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2 cups chicken, beef, or vegetable broth
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1 large onion, sliced thin
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6 stalks celery, cut in diagonal slices
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1 red bell pepper, cut in cubes
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1 1/2 cup leftover cooked pork, beef or chicken
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1 can (15 ounce size) bean sprouts, drained
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soy sauce, to taste
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1 tablespoon cornstarch, or as needed
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1/4 cup cold water