Nigella's Chocolate Guinness Cake

We have to give the Queen her due! This deliciously rich Guinness chocolate cake is made with reduced dark stout, and topped with tangy cream cheese frosting. Famous for a reason! Serves 6-8.

Ingredients: AP wheat flour, eggs, butter, sugar, sour cream, cocoa, baking soda, salt, Guinness, heavy cream, cream cheese, icing sugar, vanilla.