This dark and moist gluten free chocolate stout cake is a riff on Nigella Lawson's classic Guinness Chocolate Cake. It's made with plenty of (gluten-free) stout and capped with an irresistible cream cheese frosting.
Butter a 9-inch springform pan and line with parchment paper.
Pour the stout into a large saucepan, slice up the butter, and add to the beer. Heat over medium heat until the butter melts. Whisk in the cocoa and sugar, then set aside to cool briefly. In a small bowl, whisk together the flours and baking soda.
In a large bowl, beat the sour cream with the eggs and vanilla. Pour in the beer, then stir in the flour mixture until incorporated.
Pour the batter into the prepared tin. Preheat oven to 350℉ and let batter rest while the oven heats. Then place in the oven and bake for about 1 hour, checking to see if a tester inserted in the center comes out clean, the top is firm, and the edges of the cake are starting to come away from the sides of the pan. Remove from oven and let cool for 20 minutes in the pan, then turn out onto a rack to cool completely. I like to chill my cake in the fridge before frosting.
Make Frosting
In a large bowl, whip the cream cheese with an electric mixer. Sift the powdered sugar over and beat to incorporate. Then beat in the heavy cream.
Frost the cake with swirls of frosting. Nigella says: "Ice the top of the black cake so that it resembles the frothy top of the famous pint."