30g/1oz caster sugar
陆 tbsp cocoa powder
陆 tbsp cornflour
icing sugar, to dust
15驳/陆辞锄 milk chocolate, melted
30g/1oz pistachios, finely chopped
1 vanilla pod, seeds scraped out
butter, for greasing
100ml/3陆fl oz double cream
2 free-range egg whites
1 free-range egg yolks
50ml/1戮fl oz milk