3 tbsp coffee essence, such as Camp
2 tsp coffee granules
200g/7oz caster sugar
110g/4oz caster sugar
200g/7oz icing sugar
100²µ/3½´Ç³ú icing sugar
250g/9oz self-raising flour
vegetable oil, for frying
18 walnut halves
200g/7oz unsalted butter, softened, plus extra for greasing the tins
100²µ/3½´Ç³ú unsalted butter
4 medium free-range eggs