"Hoisin sauce has a rich, sweet flavor; look for it in the Asian section of your market...."
INGREDIENTS
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2 tablespoons hoisin sauce
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2 tablespoons rice vinegar
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1 tablespoon cornstarch
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Coarse salt
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1/2 teaspoon red-pepper flakes, plus more for serving (optional)
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1 tablespoon plus 1 teaspoon vegetable oil
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1 1/4 pounds flank steak, cut diagonally across the grain into 1/2-by-3-inch strips
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4 cloves garlic, minced
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2 scallions, sliced crosswise 1 1/2 inch thick, white and green parts kept separate
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White rice, for serving (optional)