INGREDIENTS
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Cake
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3 ¾ cups all purpose flour
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1 ¼ teaspoons baking powder
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¾ teaspoon baking soda
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1 teaspoon coarse salt
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1 cup unsalted butter, softened
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2 ½ cups packed dark-brown sugar
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4 large eggs, room temperature
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1 Tablespoon plus 1 teaspoon pure vanilla extract
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1 ¼ teaspoons rum
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1 ¼ cups buttermilk, room temperature
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Sauce
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2/3 cup packed dark-brown sugar
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6 Tablespoons butter, cut into pieces
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½ cup light corn syrup
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¼ teaspoon coarse salt
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½ cup heavy cream