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The holy grail of home baking. A crackly, blistered crust gives way to an open, tangy crumb. This is a multi-day project that requires patience, a kitchen scale, and a healthy sourdough starter. Once you master it, store-bought bread will never be the same.
Mix flour and water, let rest (autolyse) for 45 minutes to 1 hour.
Add the active starter and salt. Mix thoroughly using the pinch-and-fold method until well incorporated.
Perform 4-6 sets of stretch and folds at 30-minute intervals during bulk fermentation (3-5 hours total at room temp).
Pre-shape into a round, rest 20 minutes, then do a final tight shaping. Place seam-side up in a floured banneton.
Cover and cold-retard in the fridge for 12-16 hours.
Preheat a Dutch oven in a 500F oven for 45 minutes. Score the dough and carefully transfer to the hot pot.
Bake covered at 500F for 20 minutes, then uncovered at 450F for 20-25 minutes until deeply golden.
Cool on a wire rack for at least 1 hour before slicing. This is the hardest step.