01 - Combine bread flour and water in a large bowl, mixing until just incorporated. Cover the bowl and let the mixture rest for 1 hour to allow gluten development.
02 - Add active sourdough starter and fine sea salt to the autolysed flour mixture. Mix thoroughly until the dough becomes cohesive and ingredients are evenly distributed.
03 - Perform 4 sets of stretch and folds at 30-minute intervals over 2 hours, keeping the dough covered between each set to build gluten strength.
04 - Cover the bowl and allow the dough to ferment at room temperature for 4–6 hours until approximately doubled in volume.
05 - Turn the dough onto a lightly floured surface and shape into a tight round or oval loaf, creating surface tension.
06 - Transfer the shaped dough to a floured proofing basket with seam side up. Cover and refrigerate for 8–12 hours for cold fermentation.
07 - Preheat oven to 450°F with a Dutch oven inside for at least 30 minutes to ensure proper heat retention.
08 - Gently invert the dough onto parchment paper. Score the top surface with a sharp blade or lame to control oven spring.
09 - Transfer the loaf with parchment into the preheated Dutch oven. Cover with lid and bake for 20 minutes to create steam.
10 - Remove the Dutch oven lid and continue baking for 20 minutes until the crust achieves a deep golden brown color.
11 - Transfer the bread to a wire rack and let cool for at least 1 hour before slicing to allow internal crumb structure to set.