30g/1oz caster sugar
½ tbsp cocoa powder
½ tbsp cornflour
icing sugar, to dust
15g/½oz milk chocolate, melted
30g/1oz pistachios, finely chopped
1 vanilla pod, seeds scraped out
butter, for greasing
100ml/3½fl oz double cream
2 free-range egg whites
1 free-range egg yolks
50ml/1¾fl oz milk