Mary’s Victoria sandwich

large free-range eggs

g/8oz caster sugar, plus extra for sprinkling

g/8oz self-raising flour

level tsp baking powder

g/8oz unsalted butter, softened, plus extra for greasing

g/7oz raspberries

g/9oz jam sugar

g/3½oz unsalted butter, softened

g/7oz icing sugar, sifted

milk