I make this one all the time and it's fabulous and always gets rave reviews:
[/u]Mocha Fudge Cake with Coffee Icing
For the icing:
175g plain chocolate (70%), melted
50g unsalted butter, melted
150ml double-strength espresso
1 tsp vanilla extract
300g icing sugar
For the cake:
300g plain flour
2 tsp baking powder
1 tsp vanilla extract
3 eggs separated
125ml whole milk
4 tbsp instant coffee granules
85g unsalted butter
280g caster sugar
85g plain chocolate (70%) melted
125ml soured cream
Whisk together the cooled icing ingredients, cover and chill for 3-4 hours
Preheat the oven to 180C (160C fan)/ gas . Butter and flour two 20cm/8in cake tins.
Sift the flour and baking powder. Stir the vanilla into the egg yolks. Heat half the milk to boiling point, stir in the coffee to dissolve then add the rest of the milk and cool
Cream the butter and 200g of the caster sugar. Slowly whisk in the egg yolk mixture, then the melted chocolate. Fold in the sifted dry ingredients, the cooled milk and the soured cream. Whisk the egg whites until stiff; whisk in the remaining sugar to form firm peaks. Fold the egg whites inot the cake mixture and divide evenly between the tins.
Bake for 30 minutes, until risen. Cool and split each cake in two and layer with the icing
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