1 tsp instant coffee granules
1 tsp baking powder
75²µ/2½´Ç³ú caster sugar
250g/9oz soft dates, pitted and roughly chopped
1 tbsp demerara sugar
55g/2oz dark muscovado sugar
pinch of salt
225g/8oz self-raising flour
100²µ/3½´Ç³ú walnuts, roughly chopped
100²µ/3½´Ç³ú unsalted butter, diced and softened, plus extra for greasing
2 medium free-range eggs, lightly beaten