INGREDIENTS
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4 ounces (1 stick) room-temperature unsalted butter
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1/2 cup packed dark-brown sugar
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1 teaspoon finely grated orange zest
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3/4 teaspoon ground cinnamon
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3/4 teaspoon ground ginger
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1/2 teaspoon ground nutmeg
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6 ounces dark rum
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3 cups boiling water
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Fresh orange juice