01 - Mix flour and water in a large bowl until just combined. Cover and let rest for 1 hour to develop gluten structure.
02 - Add sourdough starter and salt to the autolysed dough. Mix thoroughly until fully cohesive and incorporated.
03 - Perform 4 sets of stretch and folds every 30 minutes over 2 hours, keeping the dough covered between sets to build strength.
04 - Cover the bowl and let the dough rise at room temperature for 4–6 hours until approximately doubled in volume.
05 - Turn dough onto a lightly floured surface. Shape into a tight round or oval loaf, creating surface tension.
06 - Transfer shaped dough to a floured proofing basket 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 thorough heating.
08 - Gently invert dough onto parchment paper. Score the top with a sharp blade, then transfer with parchment into the hot Dutch oven.
09 - Cover Dutch oven and bake for 20 minutes to create oven spring and steam.
10 - Remove lid and bake another 20 minutes until crust is deep golden brown and sounds hollow when tapped.
11 - Transfer loaf to a wire rack and cool for at least 1 hour before slicing to preserve crumb structure.