50²µ/1ΒΎ΄Η³ϊ caster sugar
cocoa powder, for dusting
100²µ/3Β½΄Η³ϊ dark chocolate, minimum 70% cocoa solids, broken into pieces
4 digestive biscuits, finely crushed
100²µ/3Β½΄Η³ϊ white chocolate
300ml/10fl oz pouring double cream
2 free-range egg yolks
1 tbsp Irish cream liqueur
dash Irish cream liqueur