lemon curd or jam for the topping (optional)
100驳/3陆辞锄 caster sugar
200g/7oz icing sugar, sifted
录 tsp fine salt
100驳/3陆辞锄 self-raising flour
1 tsp vanilla extract
100驳/3陆辞锄 unsalted butter, softened
125g/4陆oz unsalted butter, softened
2 free-range eggs, at room temperature, lightly beaten
1 tbsp milk