1 large, thin-skinned orange
1 small, thin-skinned orange (such as Valencia)
2 tbsp orange pulp, reserved from above
2 tsp baking powder
50驳/1戮辞锄 caster sugar
275驳/9戮辞锄 caster sugar
1 tsp ground cinnamon
175g/6oz icing sugar, sieved
1 tsp mixed spice
275驳/9戮辞锄 self-raising flour
50驳/1戮辞锄 butter, softened
4 free-range eggs
250g/9oz full-fat mascarpone cheese