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