(for a little box)
75g of sugar
180g of butter
Beat the egg.
Mix the flour and the sugar.
Add in the egg and rub in the butter.
On a lightly floured surface roll out the dough to a thickness of about 5 mm.
Cut in squares and prick with a fork.
Transfer on a bakeing tray and chill for 30 min.
In a preheated oven bake the shortbread for 30 to 40 minutes at 180°C.
Dust with caster sugar when still warm.
Store in a airtight container.