"Choose scallions with crisp green tops and clean white bulbs. As a rule, scallions with slender bulbs are the sweetest...."
INGREDIENTS
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1 pound fresh shiitake mushrooms, stemmed
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1 tablespoon vegetable oil
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Coarse salt and ground pepper
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1 pound asparagus, trimmed and sliced diagonally into 2-inch pieces
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2 bunches (3 to 4 cups) scallions, sliced diagonally into 2-inch pieces
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1 teaspoon white-wine vinegar