Mix the Dough: Add all ingredients to the bowl of a stand mixer fitted with a dough hook. Knead on medium speed for 10–15 minutes, until the dough is soft, elastic, and stretches without tearing.
First Rise: Transfer the dough to a lightly oiled bowl and cover with plastic wrap or a damp towel. Let it rise in a warm spot (around 23°C / 73°F) for 5–7 hours, or until doubled in size.
Shape the Loaves: Once doubled, turn the dough out onto a lightly floured surface. Divide into two portions. Working with one piece at a time, fold the edges inward, then gently tighten the surface by spinning the loaf toward you.
Cold Proof: Place each loaf seam-side up in a floured banneton basket. Slip the basket into a large plastic bag, tie it off, and refrigerate overnight for a slow, cold proof.
Preheat the Oven: The next day, place your Dutch oven inside the oven and preheat to 250°C (500°F) for 1 hour.
Score and Bake: Turn one loaf out of its banneton onto parchment paper. Score the top with a lame, razor, or sharp knife. Using the parchment, carefully lift the loaf into the preheated Dutch oven. Bake covered for 20 minutes.
Finish the Bake: Reduce the oven to 235°C (450°F), remove the lid, and bake uncovered for another 15–20 minutes, until golden brown.
Cool: Remove the bread from the Dutch oven and let it cool completely on a wire rack before slicing.