INGREDIENTS:
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1 1/2 cups balsamic vinegar
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3/4 cup hoisin sauce
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2 tablespoons unsalted butter
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Simmer vinegar, hoisin sauce, and 1/2 teaspoon salt in a small heavy saucepan, uncovered, stirring frequently, until reduced to about 1 1/2 cups, 20 to 25 minutes.
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Remove from heat and stir in butter until melted.