For the egg liqueur mousse, beat the yolks with the sugar until foamy, stir in the egg liqueur. Soak the gelatine in cold water for about 5 minutes.
Dissolve in a little cold water and fold into the egg foam. Carefully fold in stiffly whipped cream.
Pour the mixture into a bowl or 4 small bowls and let it rest in the refrigerator for about 6 – 8 hours.
To serve, scoop out dumplings with a tablespoon or turn out of the mold and serve the egg liqueur mousse dusted with cocoa powder.