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.
03 - Perform 4 sets of stretch and folds every 30 minutes over 2 hours, keeping the dough covered between sets.
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.
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.
08 - Gently invert the dough onto parchment paper. Score the top with a sharp blade.
09 - Transfer loaf (with parchment) into the hot Dutch oven. Cover and bake 20 minutes.
10 - Remove the lid and bake another 20 minutes until crust is deep golden brown.
11 - Cool on a wire rack at least 1 hour before slicing.