INGREDIENTS
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For the Spice Cake
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2 1/4 cups cake flour
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3/4 cup all-purpose flour
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1 tablespoon baking powder
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1 teaspoon baking soda
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3/4 teaspoon salt
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4 ounces (1 stick) unsalted butter, room temperature
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1/2 cup vegetable shortening, room temperature
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2 cups sugar
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1 tablespoon pure vanilla extract
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1 large egg, plus 3 large egg whites at room temperature
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1 1/2 cups ice cold water
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1 tablespoon cinnamon
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2 teaspoons ground allspice
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1 teaspoon freshly grated ginger
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3 tablespoons molasses
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1/4 teaspoon cream of tarter
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For the Eggnog Buttercream
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1 1/3 cups sugar
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1/3 cup all-purpose flour
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1 1/2 cups whole milk
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1/3 cup heavy cream
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12 ounces (3 sticks) unsalted butter, cool but not cold, cut into 1/2-inch cubes
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2 tablespoons dark rum
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1 teaspoon pure vanilla extract
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1 teaspoon freshly grated nutmeg
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1/2 teaspoon cinnamon