2 tbsp plain flour
85g/3oz caster sugar
2-3 tbsp cocoa powder, for dusting
165驳/5戮辞锄 dark chocolate (70 percent cocoa solids), chopped into small pieces
165驳/5戮辞锄 unsalted butter, cut into small pieces, plus extra for greasing
double cream, to serve
3 medium free-range eggs
3 medium free-range egg yolks