125²µ/4Β½΄Η³ϊ almonds, blanched
100²µ/3Β½΄Η³ϊ best-quality unsweetened cocoa powder
200g/7oz granulated sugar
100²µ/3Β½΄Η³ϊ 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