Mix icing sugar with vanilla sugar, starch, flour, 10 g cocoa, cinnamon, cardamom and espresso powder. Add butter in pieces. Knead first with the dough hooks of the mixer, then briefly with your hands to a smooth dough.
Preheat oven (electric cooker: 175 °C/circulating air: 150 °C/gas: see manufacturer). Line two baking trays with baking paper. Form hazelnut-sized pieces of the dough into balls, rolling in 1 espresso bean at a time.
Spread it on the sheets with a little distance between them. Bake in a hot oven for 7-8 minutes one after the other. Remove from the oven and leave to cool briefly on the baking tray. Then let it cool down on the cake rack.
Chop the couverture and melt in a hot water bath. Pour into a disposable piping bag and draw in strips over the espresso chocolate. Allow to dry. Dust with 3-4 tablespoons of cocoa.