150驳/5陆辞锄 caster sugar
75g/2陆oz toasted skinless hazelnuts, finely chopped
50驳/1戮辞锄 icing sugar
1 tsp vanilla extract
100驳/3陆辞锄 dark chocolate, broken into pieces
200g/7oz dark chocolate, broken into pieces
30g/1oz unsalted butter
75ml/2陆fl oz double cream
400ml/14fl oz double cream
1 large free-range egg
3 large free-range egg yolks