5 oranges
1 orange, zest only
1 tsp baking powder
200g/7oz caster sugar
3 tbsp demerara sugar
100驳/3陆辞锄 flaked almonds
200g/7oz ground almonds
icing sugar
1 vanilla pod, seeds removed and pod discarded
120g/4陆oz softened unsalted butter, plus extra for greasing
3 free-range eggs, separated
250g/9oz ricotta, drained
150ml/5fl oz cognac
whipped cream mixed with cognac