- [Day 1] Mix the dough. Stir together sourdough starter, water, and salt in a large bowl. Add bread flour and mix until it starts to form a shaggy mass. Cover the bowl with plastic wrap or a clean kitchen towel and let it rest for at least 30 minutes. 
- Stretch and fold. Pull dough from one side and give it a long stretch, then fold dough back to the middle. Turn bowl a quarter turn, stretch again and fold back to the middle. Repeat on all four sides, cover the dough back up, and allow it to rest again. 
- Repeat. Over the next few hours, you’ll repeat this process of stretching and folding the dough about every 30-45 minutes or so (exact time doesn't matter). Plan to stretch and fold a total of four times, or until dough feels hydrated, smooth, and elastic. 
- Cold ferment. After the last stretch and fold, cover the dough back up and place it in the refrigerator overnight.* 
- [Day 2] Prep. Remove sourdough from refrigerator and let it warm up a bit at room temperature. Line a large bowl with a tea towel and dust it lightly with flour. 
- Shape. Scrape dough out of its bowl onto a clean countertop. Shape dough into a rough ball, pulling it towards you to create tension. Flip dough over, placing seam side up in the towel-lined bowl. Cover with a kitchen towel or plastic wrap. 
- Proof. Let dough rise until puffy and bubbly, about 1-3 hours**. Preheat oven to 450° F. Place your Dutch oven pan in the oven to preheat during this time, if using. 
- Score. Carefully tip dough out onto a sheet pan lined with parchment, seam side down. Remove towel. Score dough with a bread lame or very sharp knife in any desired pattern. 
- Bake. Lift parchment paper with sourdough, lowering it carefully into Dutch oven. Bake with lid on for 25 minutes. Remove lid and continue to bake, uncovered, for another 18-25 minutes, or until bread is golden and cooked through and internal temperature is 205 – 215° F.  
- Cool. Let bread cool at least an hour before slicing into it.