Not your boring sponge: Part the Second

Time to finish off the cake!

Coffee and Walnut Cake Continued
Ingredients
For the sandwich layer:

• 50g/2oz Butter
• 1 Egg yolk (left over from the cake)
• 125g/4oz Caster sugar
• 50g/2oz Walnuts, finely chopped
• 60ml/2fl oz Strong black coffee
• 1/2 tsp Vanilla extract

For the top:

• 120g/4oz Icing sugar
• 60ml/2fl oz Strong black coffee
• Walnut halves to decorate

Method

1. Cream the butter in a bowl then beat in the other sandwich layer ingredients
2. Cut the cooled cake in half horizontally and spread the sandwich layer mixture on the lower half before replacing the upper half
3. Sift the icing sugar into a bowl and stir in the coffee
4. Add water gradually until the icing reaches a spreadable consistency
5. Spread the icing over the top of the cake using a warm palette knife and allow to set
6. Decorate the top with the walnut halves

Here is the end product:

I'm really not sure about this cake. The icing was ridiculously runny (unsurprising given the coffee:sugar ratio) so ended up as more of a glaze than anything else. And the sandwich layer also turned out much more liquidy than I expected. We shall see, but I suspect this might be one of the less successful cakes...