Cut the apricots into small cubes. Heat honey and sugar in a pot at medium heat for about 10 minutes until the sugar has dissolved. Set aside and let cool. Stir the potash with 2 tbsp. water.
butter, gingerbread spice, flour, cocoa, eggs, potash, rum, apricots, hazelnuts and honey-sugar mixture in egg
Wrap in foil and chill for at least 3 hours, preferably overnight.
Roll out the dough in several portions on a floured work surface to a thickness of about 0.5 cm. Cut out rhombs (approx. 3.5 x 6 cm). Knead the rest of the dough with the next portion again and again. Place on 4 baking trays lined with baking paper.
Bake in the preheated oven (electric cooker: 175 °C/ convection oven: 150 °C/ gas: see manufacturer) for 10-12 minutes one after the other. Remove and let cool on a cake rack.
Sift the icing sugar. Mix 150 g icing sugar and jam. Mix 75 g icing sugar with 2 tsp. water. Brush one half of the lozenges with red icing. Pour white icing into a piping bag and draw a line in the middle of the rhombus and a dot at the tip.
Allow to set for at least 4 hours, preferably overnight.