Whisk together dry ingredients.  Add water and mix with spoon until combined.

Cover with plastic wrap and refrigerate overnight.

Take out of fridge 1 hour before baking, to allow to come to room temperature.

Pre heat oven to 220°C.

Line a tray with baking paper and dust with flour, place half the dough on top and bake for 45 minutes – 1 hour. Once it is golden and the inside sounds hollow when knocked on the base, it is ready.