Lemon shortbread

1. METHOD
1) Sift flour into a large bowl,then rub in the butter until the mixture resembles breadcrumbs,stir in sugar and lemon zest.
2)Knead will to form a smooth dough.
3)Roll the dough into a sausage shape approx 7cm in diameter, Roll the dough in sugar,Wrap in cling film and chill until dough is firm.
4) Preheat oven to gas mark 3
5) Grease baking tray
6) Cut into slices just under 1cm in thickness
7) Bake for 30mins until pale and golden.