Scottish Shortbread - cooking recipe

Ingredients

12 oz. all-purpose shortbread
8 oz. lightly salted butter
4 oz. sugar
pinch of salt

Preparation

Place sugar on a baking board and put butter on top.
Kneading gently with the fingers and heel of hand, mix together.
When all sugar is absorbed into the butter, add flour to the board (maybe a 1/4 of the total amount at a time) and knead until all the flour is absorbed and dough is smooth, not breaking apart.
Cut the dough in half and roll each piece to approximately 7-inch in diameter (it will be about 1/2-inch thick).
Crimp the edges and prick all over with a fork.