INGREDIENTS
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Makes 8-10 servings
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For the Guinness chocolate cake
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1 3/4 cups all-purpose flour
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2 cups granulated sugar
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3/4 cup unsweetened cocoa powder
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2 teaspoons baking soda
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1 teaspoon baking powder
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1 teaspoon fine salt
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3/4 cup sour cream
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1/2 cup vegetable oil
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3 large eggs, at room temperature
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1 teaspoon vanilla
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1 cup Guinness beer
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For the Irish buttercream
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4 sticks (1 pound) unsalted butter, at room temperature
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1 3/4 pounds (about 6 1/2 cups) confectioners’ sugar, sifted
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1/4 cup plus 2 tablespoons Irish liqueur cream, such as Bailey’s