Ingredients:-
for the sponge
* 50 grams walnut pieces
* 225 grams caster sugar
* 200 grams plain flour
* 4 teaspoons instant espresso powder
* 2 1/2 teaspoons baking powder
* 1/2 teaspoons bicarbonate of soda
* 4 large egg
* 1-2 tablespoons milk
for the butter-cream frosting
* 350 grams icing sugar
* 175 grams soft unsalted butter
* 1 1/2 teaspoon instant espresso powder (dissolved in 1 tablespoon boiling water)
* approx. 10 walnut halves (to decorate)
Method
1. Preheat the oven to 180 C/ gas mark 4/ 350F.
2. Butter two 20cm/ 8 inch sandwich...