1 tsp baking powder
225g/8oz light brown muscovado sugar
150驳/5陆辞锄 icing sugar, sifted
225g/8oz self-raising flour
75驳/2陆辞锄 walnuts
25g/1oz walnut halves
250g/9oz fudge, roughly chopped
225g/8oz butter, softened, plus extra for greasing
150驳/5陆辞锄 butter, softened
4 large free-range eggs