01 - In a large bowl, combine bread flour and water, mixing until just combined. Cover bowl and let rest for 45 minutes to allow flour hydration.
02 - Add sourdough starter and sea salt to the hydrated flour mixture. Mix thoroughly by hand, squeezing and folding dough until fully incorporated and smooth.
03 - Cover dough and let rest for 30 minutes at room temperature to relax gluten.
04 - Perform 4 sets of stretch and folds at 30-minute intervals. For each fold, grasp one edge of dough, stretch upward, and fold over center. Rotate bowl one-quarter turn and repeat until all sides are folded.
05 - After final fold, cover dough and let rise at room temperature for 4-6 hours, or until approximately doubled in size with visible bubbles on surface.
06 - Lightly flour work surface. Turn dough out onto surface and gently shape into a round boule or oval batard, creating surface tension.
07 - Place shaped dough seam side up in a well-floured banneton proofing basket or bowl lined with floured kitchen towel.
08 - Cover and proof at room temperature for 2-4 hours, or refrigerate overnight for 8-12 hours for enhanced flavor development and easier scoring.
09 - Preheat oven to 450°F with Dutch oven or heavy lidded pot inside for at least 30 minutes to ensure proper heat retention.
10 - Turn dough out onto parchment paper. Use bread lame or sharp knife to score top of loaf with desired pattern. Carefully transfer dough and parchment to preheated Dutch oven.
11 - Cover Dutch oven with lid and bake for 25 minutes to create steam and develop oven spring.
12 - Remove lid and bake for additional 20 minutes, or until crust is deeply golden brown and loaf sounds hollow when tapped on bottom.
13 - Transfer loaf to wire rack and cool completely for at least 1 hour before slicing to prevent gummy texture.