1 large, thin-skinned orange
1 small, thin-skinned orange (such as Valencia)
2 tbsp orange pulp, reserved from above
2 tsp baking powder
50²µ/1¾´Ç³ú caster sugar
275²µ/9¾´Ç³ú caster sugar
1 tsp ground cinnamon
175g/6oz icing sugar, sieved
1 tsp mixed spice
275²µ/9¾´Ç³ú self-raising flour
50²µ/1¾´Ç³ú butter, softened
4 free-range eggs
250g/9oz full-fat mascarpone cheese