16 chocolate-covered coffee beans
1 tbsp coffee essence
1 level tsp baking powder
450g/1lb icing sugar, sifted
150驳/5陆辞锄 light muscovado sugar
150驳/5陆辞锄 self-raising flour
75g/2陆oz chopped walnuts
200g/7oz walnut halves, finely chopped
150驳/5陆辞锄 butter, softened
3 large free-range eggs
2 tbsp milk