Whip the cream until stiff. Sprinkle vanilla sugar and cream setting agent into the mixture. Mix crème fraîche and amaretto. Fold in the cream.
Finely crumble the cake base and add to the amaretto cream. Fold in with a dough scraper and work into a kind of dough. Form 8 evenly sized balls from the mixture with your hands and cover them at least with a lid.
Chill for 2 hours.
Roughly chop the chocolate coating. Melt with the plate-grease in a hot water bath. Then let it cool down lukewarm. Dip the sponge balls one after the other into the couverture using two tablespoons. Drain on baking paper and decorate with candied flowers if desired.
Refrigerate again for about 1 hour. Serve in paper baking cups.