Nigella's Chocolate Guinness Cake

Here's a recipe for a deep chocolate cake that's easy to make. Instead of frosting this, we sprinkled powdered sugar on it. The cake is sweet enough that you don't need the frosting.

Ingredients:

1 cup Guinness
1 stick plus 2 tablespoons unsalted butter
3/4 cup unsweetened cocoa
2 cups superfine sugar
3/4 cup sour cream
2 eggs
1 tablespoon pure vanilla extract
2 cups all-purpose flour
2 1/2 teaspoons baking soda

Preparations:

1. Preheat the over to 350 F, and butter and line a 9 inch springform pan.
2. Pour the Guinness into a large wide saucepan, add the butter — in spoons or slices — and heat until the butter's melted, at which time you should whisk in the cocoa and sugar.
   
3. Beat the sour cream with the eggs and vanilla and then pour into the brown, buttery, beery pan and finally whisk in the flour and baking soda.
   
4. Pour the cake batter into the greased and lined pan and bake for 45 minutes to an hour.
5. Leave to cool completely in the pan on a cooling rack, as it is quite a damp cake.
   
6. When the cake's cold, sit it on a flat platter or cake stand and sprinkle with powdered sugar.