2 tbsp plain flour
85g/3oz caster sugar
2-3 tbsp cocoa powder, for dusting
165²µ/5¾´Ç³ú dark chocolate (70 percent cocoa solids), chopped into small pieces
165²µ/5¾´Ç³ú 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