Autolyse. Mix flours and 335 g water until shaggy. Rest.
Add Starter & Salt
Mix in starter and salt. Add reserved water as needed until dough feels supple.
Bulk Fermentation (3.5–5 hours)
After 30 minutes: Laminate dough, scatter cranberries, chocolate, zest.
Perform 2–3 coil folds. Dough should rise ~60%.
Preshape, rest 20 minutes, shape into boule or batard. Refrigerate 8–20 hours.
Bake
Preheat Dutch oven 475°F for 45 min.
Bake covered 25–30 min at 465°F.
Bake uncovered 10–15 min at 440–450°F.
Optional: brush with syrup + sprinkle spiced sugar for Christmas bread sparkle.