How to make them:
Quickly mix all the ingredients to a short-crust dough and leave it in a cool place for one hour.
Roll out the dough to a thickness of about 1 cm before cutting into small pieces and forming crescent-shaped biscuits.
Place the cookies on an ungreased baking tray and bake at a moderate temperature (200°C) for around 10 minutes or until they turn a light brown colour.
Mix icing sugar and vanilla sugar together, then toss the hot cookies in the mix.
Store the biscuits in a sealed tin for several days for them to become crumbly.