Mix the sugar, salt, flour.

Using your fingers, incorporate the butter into the flour. The mixture should start to look like large crumbs at this point.

Continue until you have a crumbly mixture similar to coarse breadcrumbs.

Add the egg yolk.

Add the water until mixture forms into a dough.

Refrigerate for 20-30 minutes and roll.

Bake at 200 degrees Celsius for 10-12 minutes.