1 tsp instant coffee granules
1 tsp baking powder
75驳/2陆辞锄 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
100驳/3陆辞锄 walnuts, roughly chopped
100驳/3陆辞锄 unsalted butter, diced and softened, plus extra for greasing
2 medium free-range eggs, lightly beaten