INGREDIENTS
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2 1/4 sticks plus 1 tablespoon unsalted butter
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1 1/4 cups Guinness stout beer
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1 cup unsweetened cocoa powder, sifted
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2 large eggs
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2 cups plus 2 tablespoons superfine sugar
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2 teaspoons vanilla extract
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3/4 cup buttermilk
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2 1/2 cups all-purpose flour
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2 teaspoons baking soda
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1 teaspoon baking powder
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For the frosting:
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7 Tablespoons unsalted butter, softened
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2 1/2 cups sifted confectioners' sugar
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1 teaspoon vanilla extract
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1 1/4 cups cream cheese