Mix the butter and sugar until frothy and stir in the eggs. Stir in the hazelnuts, chocolate, bitter almond oil, eggnog and rum. Mix the baking powder, flour and gingerbread spice and mix with the dough.
If the dough is too soft, you can make the dough a little firmer by adding ground nuts.
Spread the mixture on wafers and bake at 175 ° C for 15-20 minutes. After cooling, coat the gingerbread with a thick layer of chocolate.