Brown Sugar Shortbread

1 cup/ 250ml brown sugar
1 lb/ 450g soft butter
5 cups/ 1.25L sifted all-purpose flour

(optional)
1 egg yolk
1 tbsp milk

1. Combine all ingredients and squeeze and knead the dough with hands until smooth and satiny, about 20 minutes.
2. Chill overnight
3. Heat oven to 150 C
4. Work dough, bit by bit, with hands until soft enough to roll. Roll 0.5cm thick and cut into desired shape. (optional - brush egg-yolk and milk over top of cookies)
5. Bake 20 to 25 minutes or until set but only lightly browned on the bottom.

Makes 60 cookies