The night before you want to bake bread, add the starter to a large mixing bowl and do your feed with the water and flour in the Levain ingredients.
In the morning, add remaining ingredients to the bowl with your starter. Mix until just combined then let sit 20-30 minutes. Then knead until it comes together well.
Cover and let sit until doubled, about 6 hours.
If you’re around, have the time/bandwidth, over the first few hours, gently knead the bread 4-6 times, then cover it back up.
When doubled, decide if you’re going to shape into loaf pans or free form loaves.
If you’re doing loaf pans, simple divide the dough in half in the bowl with wet hands, form a log by rolling the dough in the bowl/in the air, and then putting it in a greased loaf pan, covering and let rise until double. (About 2-3 hours) we are not going for fancy shaping here, friends!
If doing free form, shape the same way, but into a ball. I used a large soup/small serving bowl and a 4 cup measuring cup both lined with parchment. These will not be flipped, the top is the top of the bread, you will take the parchment out as a sling into a hot pan/pot.
Make sure your bread is really actually doubled- get your finger dusted with flour and poke the dough, if the dough springs back, it needs to rise more. If the indent stays, it's good!
Preheat oven to 425°F.
If baking free form, put your cast iron pan or oven safe pot with lid in the oven to heat up.
When oven is up to temp, Move free form loaves to your hot pan with the parchment as a sling.
If using loaf pans, slide them into the oven.
Bake 20 min, then turn loaves around/take lid off if youre using a pot with a lid. Bake another 15 min or until internal temp is above 180°F.