130²µ/4½´Ç³ú caster sugar
40g/1½oz chopped hazelnuts
50g/1¾oz neutral-flavoured oil, such as rapeseed
pinch sea salt flakes
125²µ/4½´Ç³ú dark chocolate, minimum 70% cocoa solids
400g/14oz dark chocolate, minimum 55% cocoa solids
375g/13oz double cream
150g/5½oz free-range egg yolks