Method
1. Add all purpose flour, cornstarch and salt to a clean large mixing bowl
2. Whisk briefly and set aside
3. Add unsalted butter and granulated sugar to a clean large mixing bowl
4. Cream together until pale and light
5. Transfer dry ingredients to dough
6. Knead until dough forms
7. Chill - 30 min
8. Pre-heat a clean baking pan oven - 150°C
9. Line with parchment paper
10. Roll out until 1 cm thick
11. Slice
12. Prick lightly
13. Bake until golden brown - 25 min, 150°C
14. Transfer onto cooling rack