Levain
40g bread flour
40g whole wheat flour
81g water
8g ripe sourdough starter
Main Dough
766g bread flour
161g whole wheat flour
19g salt
685g water
169g ripe levain
Levain (7:00 a.m. before work)
In a small container, mix the Levain ingredients and keep it at a warm temperature for 10 hours.
In a medium mixing bowl, add all of the levain, 766g bread flour, 161g whole wheat flour, and 635g water (50g was reserved for mixing, later) and mix until no dry bits remain. Cover the bowl and let rest for 20 minutes.
Mix (5:20 p.m.)
To the mixing bowl holding your dough, add 19g salt and some of the reserved 50g water (or all if the dough feels like it can handle it). Mix thoroughly and strengthen the dough for about 5 minutes. Using wet hands, mix everything until it comes together into a shaggy mass. This dough is relatively strong and doesn’t require intensive kneading (like slap and fold), but give it a few folds in the bowl, perhaps 5-10, until it smooths slightly. Transfer the dough to a bulk fermentation container and cover.
Divide and Preshape (9:00 p.m.)
Lightly flour your work surface and scrape out your dough. Using your bench knife, divide the dough in half. Lightly shape each half into a round shape. Let the dough rest for 30 minutes, uncovered.
Shape (9:30 p.m.)
Shape the dough into a round (boule) or oval (batard), then place the dough in proofing baskets.
Proof (9:30 p.m. to 7:00 a.m. or 6:00 p.m. the next day)
Cover proofing baskets with reusable plastic and seal shut. Then, place both baskets into the refrigerator and proof overnight.
Bake (The next day, bake at 7:00 a.m. before work, or 6:00 p.m. after work)
Preheat your oven with a baking surface or combo cooker/Dutch oven inside to 450°F (230°C). Remove your dough from the fridge, score it, and transfer it to the preheated baking surface or combo cooker. Bake for 20 minutes with steam. After this time, vent the steam in the oven or remove the lid (you can keep it in the oven or remove it) and continue to bake for 30 minutes longer. When done, the internal temperature should be around 204°F (95°C). Let the loaves cool for 2 hours on a wire rack before slicing.
This recipe is wonderful left plain, or you could top the dough with rolled oats, white sesame seeds, or flax seeds.