Put syrup, sugar and margarine in a saucepan and bring to a boil.
Add potash when the mass is bubbling.
Remove the pan from the heat and add the cinnamon, allspice and crushed cinnamon.
Finally add the lemon juice and grated lemon zest, and mix it all well.
Put the mass in a bowl, and knead the flour in until you have a uniform dough.
Turn the oven on 180 ° C hot air.
Roll out the dough while it is still warm.
Cut the cookies into desired shapes with a knife or cookie cutters. The dough that is left over can be rolled out again.
Place the cookies on a baking sheet lined with parchment paper.
Bake the cookies in the oven for about 6-8 minutes.
Allow the cookies to cool on a rack before placing in cake tins with tight-fitting lids.