Grind the gingerbread spices, anise star, anise seed, cloves, allspice and remove any larger particles by sifting the mixture through a coarse siee. Mix the ground spices with 1/2 tsp ground cinnamon.
Melt 1/2 stick unsalted butter and honey, if honey is granulated
MIx flour, dark cocoa powder, baking soda and then sift these dry ingredients into a large mixing bowl. Add powdered sugar, 1/2 tbsp gingerbread spice, egg, melted butter and honey
Use a form to mix the ingredients until they form compact chunks. Carefully transfer the mixture onto a work surface and knead it by hand into a smooth, slightly sticky dough
Wrap the dough in plastic wrap and let it rest in the fridge overnight
Roll out the rested dough on a lightly floured work surface to a thickness of about 1/8 inch. Cut out your desired shapes from the dough, carefully lift them with a pastry spatula and transfer them to a baking sheet lined with parchment paper
Preheat the oven to 325 degree F and bake the cookies for 8 minutes. The baking time depends on the cookie size; smaller ones need less time, while larger shapes will require a minute or two longer in the oven
If you want your gingerbread cookies to hae a shiny surface, prepare 1 egg yolk in a bowl and beat it with a fork. As soon as you take the cookies out of the oven, brush them thinly with the yolk. The heat from the gingerbread will cause the egg yolk to firm up, creating a glossy layer
Prepare the sugar icing by sifting 1 up powdered sugar and 1 tbsp potato starch into a bowl. Add 1/2 egg white and mix well until you achieve a thick glaze. Add any food coloring you want. The icing should be thick enough that when you scoop it with a spoon it doesn't run off but falls down in chunks. Pour the frosting into a piping bag fitted with a #2 or #3 piping tip and decorate the gingerbreak cookies to your liking. Allow the cookies to dry overnight before piping another layer. If you want soft cookies, bake them 3-4 weeks in advance and store them in breathable paper box in cold dark place.