Scottish Shortbread

Mix flour and salt and rub in butter and sugar.

Knead to a dough, then roll out and form into a round cake.

Crimp the edges, prick all over with a fork and mark into portions with a knife besore baking.

Place on a baking sheet lined with greased paper and bake in a slow oven for 1 hour.

Dredge with castor sugar.