MAKE THE PASTRY. Place the flour and salt into a large mixing bowl with the butter and work them together with your fingertips until the mixture resembles breadcrumbs. Sift the icing sugar and combine with this mixture, then add the beaten egg yolk.
SHAPE INTO A BALL OF DOUGH AND WRAP IN PLASTIC WRAP. Let it rest in the fridge for 1 hour.
ROLL OUT THE PASTRY AND