Take melted butter in a large mixing bowl. Add honey and stir. Add walnut, baking soda and vanilla sugar and stir.Start to knead by adding flour slowly and stop adding flour until the dough reaches a soft consistency. Take small parts ( about the size of whole walnut ) from the dough and give them the shape of small balls. Place them on a greased baking tray. Preheat the oven 350 F. Bake the cookies for 15 to 20 minutes.