Blend togehter ground ginger, cardamom, Spekulatius spice, salt and the pepper blend with a stone mortar and pestle, until everything is extra fine.
Add flour, sugar, baking powder and cocoa powder.
In a measuring cup combine honey, maple syrup and oil.
Add the liquid ingredients to the dry ingredients either by hand or stand mixer with the paddle attachment until dough holds together. If necessary add 1-2 tbsp water to bind the dough. Knead into a smooth ball. If it's too sticky to touch add a small amount of flour. Press into a disc, wrap in cling foil and leave in the fridge for at least 4 hours or overnight. It's easier to work with the dough after a longer resting time.
On a lightly floured surface, roll out the dough to 1/3 inch (8mm) if you are using an embossed rolling bin and cookie stamps. If your are just using recular cookie cutter you can roll out the dough thinner. Put the cut out cookies onto prepared baking sheets (lined with parchment paper) and leave between each a 1cm (1/2inch) gap.
If using an embossed rolling pin or a cookie stamp I would recommend drying the cookies for 12-24 hours (or freeze them for 1-2hours, I’ve read that should help too) It helps the pattern to stay while baking and not to melt away.
If not using an embossed rolling pin or cookie stamp than you can bake the cookies right away.
Preheat the oven to 150°C. Bake the cookies for 12 minutes, rotating the sheets halfway through.
Brown butter glaze
For the brown butter: in a sauce pan over medium heat place your butter to melt. Once melted, kick the heat up to medium high and cook until fragrant and golden brown. Remove from heat, and transfer to a mixing bowl. Be careful not to burn the butter.
Combine the brown butter, icing sugar, maple syrup, vanilla extract and milk. I divided the glaze into two bowls to make one thinner for the cookies with the embossement and a thicker one. Brush or dab the cookies with the glaze.