Method
Build starter the night before and let sit at 74-78F until doubled.
Combine flour, cocoa, and water (A); mix 3 mins at speed 1. Autolyse for 60 mins.
Add salt, yeast, and levain. Mix 5 mins speed 1, 2 mins speed 2.
Add water (B) via bassinage. Incorporate chocolate and cranberries.
Ferment 45 mins at 73-75F. Perform one fold, then refrigerate for 15 hours at 3°C (37°F).
Divide into 290g portions, pre-shape, and rest 30 mins.
Shape into 35-40cm baguettes and proof 60 mins.
Bake at 250°C (480°F) with steam for 10 mins, then 10 mins without.