1 orange, finely grated zest only
1 orange, finely grated zest and 2 tbsp juice
orange zest
2 level tsp baking powder
225g/8oz caster sugar
150g/5oz icing sugar, sifted
220驳/7戮辞锄 self-raising flour
225g/8oz unsalted butter, softened, plus extra for greasing
75g/2戮oz unsalted butter, softened
4 free-range eggs