Mix levain ingredients, cover with cling wrap. Let stand room temperature overnight

Mix flour, water, and levain with wooden spoon (it will be sticky)

Cover and let stand for an H

Knead in salt and water

Cover and rest for an H

Folding time set (3 times per set), every 30 mins - repeat 4 times

Rest 4 H

Divide into two

Shape to round

Rest 20 mins

Fold, shape

Place into bowls, lined with tea towels and floured generously

Chill overnight

The next day, take out from the fridge

Score with razor

Bake covered, preheated 450 F, 30 mins

Then bake uncovered, 20 mins

Rest then slice