I love shortbread and bake some myself on a frequent basis.
Just add a cuppa (coffee/tea) and you're good to go. :-)
Shortbread traditionally consists of three parts flour, two parts butter and one part sugar. It comes in different shapes such as "fingers" or "petticoat tails" and you can find it in any Scottish supermarket. In Aberlour, the well-known manufacturer Walkers has a factory sale.
450 g flour (including one third rice flour)
250 g salted butter
150 g caster sugar