How to cook
Make the butter and flour into crumbs and add 1 tbsp powdered sugar.
Mix a dough with 1 egg and 1 egg yolk, roll it out and cut out cookies of the desired shape.
Bake them in a moderate oven in a tray with baking paper.
If desired, you can smear them with a beaten egg, sprinkle with sugar or ground walnuts or almonds.
Once the cookies are baked you can stick them together with marmalade or a jam of your choice.