INGREDIENTS
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1 (18.25-ounce) box yellow cake mix (recommended: Betty Crocker)
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1/4 cup dark rum
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1 cup water
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3 eggs
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1/3 cup vegetable oil
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1 cup (2 sticks) unsalted butter
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2 cups dark brown sugar
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1/4 cup milk
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4 cups powdered sugar, sifted
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1 teaspoon rum extract