Beat the butter, sugar, salt and liquorice powder into a light, airy batter. Blend the nuts and flour with the milk and mix everything together to a dough. Leave in your fridge for 1 hour.
Roll out the dough to a thickness of 0.5cm. Cut into shapes with a sharp knife and place them on a sheet of baking paper. Bake until golden brown in the middle of a preheated oven at 200°C for about 10-15 minutes. Decorate with icing when the biscuits are cool.