INGREDIENTS
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Cake:
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1 1/2 cups unsalted butter, at room temperature
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2 1/3 cups sugar
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3 large egg whites
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2 tsp. vanilla extract
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3 cups cake flour
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3/4 tsp. baking soda
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3/4 tsp. salt
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1 1/2 tsp. baking powder
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1 1/2 cups buttermilk
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Buttercream:
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3 large eggs
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4 large egg yolks
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1/2 cup water
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2 cups sugar
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3 cups unsalted butter, at room temperature
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1/2 tsp. salt
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3 Tbsp. Jack Daniels whiskey