Ingredients
1 cup Irish stout beer (such as Guinness(r))
1 cup butter, cut into pieces
3/4 cup unsweetened cocoa powder
2 eggs
2/3 cup sour cream
2 cups all-purpose flour
2 cups white sugar
1 1/2 teaspoons baking soda
3/4 teaspoon salt
3 cups confectioners’ sugar, or as needed
1/2 cup butter at room temperature
3 tablespoons Irish cream liqueur (such as Baileys(r)), or as needed
8 ounces bittersweet chocolate, coarsely chopped
2/3 cup heavy cream
2 tablespoons butter at room temperature
Directions
Preheat oven to 350 degrees F (175 degrees C). Line 2 9-inch cake pans with parchment paper, and spray with cooking spray.
Pour the beer into a saucepan, add the butter, and bring to a simmer over medium-low heat. Remove the pan from the heat, and whisk in the cocoa powder until the mixture is smooth. Allow the mixture to cool. In a bowl, beat the eggs and sour cream together until smooth with an electric mixer, and stir in the stout mixture to make a smooth, thick liquid.
In a large bowl, mix together the flour, sugar, baking soda, and salt. Pour the stout mixture into the flour mixture, and gently combine with a spatula. Pour the batter into the prepared pans.
Bake in the preheated oven until the cakes are set and a toothpick inserted into the center of a cake comes out clean, about 30 minutes. Remove and let cool in pans for 5 minutes before inverting the cakes onto wire racks to finish cooling.
Mix together the confectioners’ sugar, butter, and Irish cream liqueur until the mixture forms a smooth and spreadable frosting (add more sugar or liqueur as needed to create the desired consistency). Spread half the frosting on top of each cake.
Place the chopped chocolate into a heatproof bowl. Bring cream to almost boiling in a small saucepan, and pour over the chocolate. Stir in the butter, and stir the mixture until the chocolate melts and the mixture is v
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