150²µ/5½´Ç³ú caster sugar
75g/2½oz toasted skinless hazelnuts, finely chopped
50²µ/1¾´Ç³ú icing sugar
1 tsp vanilla extract
100²µ/3½´Ç³ú dark chocolate, broken into pieces
200g/7oz dark chocolate, broken into pieces
30g/1oz unsalted butter
75ml/2½fl oz double cream
400ml/14fl oz double cream
1 large free-range egg
3 large free-range egg yolks