Add 600 g water and the flours to the bowl of a stand mixer and mix on low for 2-3 minutes.
Add salt and remaining 50 g water and mix for a further 3-4 minutes.
Add the oil and knead for 2 more minutes.
Smooth the dough into a ball and feet at room temp for 4 hours, then in the fridge for up to 24 hours.
4 hours before baking remove from the fridge, divide into 280 g portions, and shape into balls. Dust with flour and cover with plastic wrap.
