16 chocolate-covered coffee beans
1 tbsp coffee essence
1 level tsp baking powder
450g/1lb icing sugar, sifted
150²µ/5½´Ç³ú light muscovado sugar
150²µ/5½´Ç³ú self-raising flour
75g/2½oz chopped walnuts
200g/7oz walnut halves, finely chopped
150²µ/5½´Ç³ú butter, softened
3 large free-range eggs
2 tbsp milk