01 - In a large bowl, mix the flour and water until just combined. Cover and let rest for 1 hour (autolyse).
02 - Add the sourdough starter and salt. Mix thoroughly until the dough is cohesive and fully incorporated.
03 - Perform 4 sets of stretch and folds every 30 minutes over 2 hours, keeping the dough covered between sets to develop strength.
04 - Cover the bowl and let the dough rise at room temperature for 4-6 hours, or until roughly doubled in size.
05 - Turn the dough out onto a lightly floured surface. Shape into a tight round or oval loaf, creating surface tension.
06 - Transfer the shaped dough to a floured proofing basket (seam side up). Cover and refrigerate 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 with a sharp blade or lame in desired pattern.
09 - Transfer loaf with parchment into the hot Dutch oven. Cover with lid and bake for 20 minutes to create steam.
10 - Remove the lid and bake another 20 minutes until crust is deep golden brown and internal temperature reaches 205-210°F.
11 - Cool on a wire rack for at least 1 hour before slicing to allow internal crumb to set properly.