Flip cold dough onto a lightly floured surface, sticky side up. Stretch‐and‐fold the left and right sides, then the remaining corners. Flip seam-side down and tighten by tucking and rolling 20–30 times.
Dust a proofing basket and the loaf with flour. Place seam-side up; proof 45–75 minutes at about 80 °F.
Preheat a Dutch oven to 480 °F/250C (25 minutes).
Turn loaf seam-side down into the hot pot, dust with semolina, score six 1-inch-deep slashes, cover, and bake 20 minutes. Remove lid; bake 25–35 minutes more. Cool on a wire rack.
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