Heat the syrup, sugar and fat in a saucepan until the sugar has dissolved. Put flour, cream, egg, baking powder, gingerbread spice and salt into a mixing bowl, add sugar-syrup-fat mixture and work into a smooth dough with the dough hooks of the hand mixer.
Put the dough on a baking tray lined with baking paper, smooth it down and carefully spread the poppy seed mixture on top. Bake the gingerbread in a preheated oven (electric: 175 °C/ gas: level 2) for 25-30 minutes.
Take the gingerbread out of the oven and let it cool down on a cake rack. Cut the gingerbread into lozenges. Melt the couverture on a hot water bath and dip each corner of the lozenges halfway.
Drain the dipped rhombs, place them on a baking tray lined with baking paper and leave to dry. Decorate each rhombus with a nut as desired. Makes about 50 pieces.