125驳/4陆辞锄 almonds, blanched
100驳/3陆辞锄 best-quality unsweetened cocoa powder
200g/7oz granulated sugar
100驳/3陆辞锄 digestive biscuits
200g/7oz unsalted butter, softened
1 large free-range egg, preferably organic
the yolk of 1 large free-range organic egg
3 tbsp orange-flavoured liqueur