200g/7oz raspberries
1 level tsp baking powder
225g/8oz caster sugar, plus extra for sprinkling
200g/7oz icing sugar, sifted
225g/8oz self-raising flour
250g/9oz jam sugar
225g/8oz unsalted butter, softened, plus extra for greasing
100g/3Β½oz unsalted butter, softened
4 large free-range eggs
2 tbsp milk