Prepare the Levain (Night Before):
Combine 50g sourdough starter with 100g warm water and 100g bread flour.
Cover and let it rest at room temperature for 12 hours.
Mixing the Dough:
In a large bowl, dissolve the levain in 375g warm water.
Add 500g bread flour to the mixture, ensuring there's no dry flour left. Allow it to rest for 45 minutes (autolyse stage).
While the dough is autolysing, soak your cranberries or Craisins.
Adding Salt and Flavor:
Add 10g salt and initially mix until the salt is evenly distributed, approximately 10 minutes.
Bulk Fermentation:
Cover the bowl and let the dough rest at room temperature for 45 minutes.
Incorporate 75g dried cranberries and 75g chopped walnuts into the dough. Fold the dough over itself several times to integrate the additions. Add them gradually if your dough isn't strong enough to handle them without breaking.
Perform three sets of stretch and folds or coil folds every 45 minutes.
Shaping:
Turn the dough onto a lightly floured surface.
Gently shape it into a round loaf.
Second Rise:
Place the shaped loaf into a well-floured banneton or a bowl lined with a floured towel.
Cover and let it rise for 1 hour or until it's slightly puffy but not doubled in size. If it's already puffy, proceed straight to refrigeration over now, or for 6 hours.
Baking:
Preheat your oven to 450°F (232°C) with a Dutch oven inside.
Carefully transfer the dough into the hot Dutch oven, seam side down.
Score the top, cover, and bake for 20 minutes.
Remove the lid and continue to bake for another 25-30 minutes, or until deep golden brown, and the internal temperature reaches 200°F (93°C).
Cooling:
Let the bread cool on a wire rack for at least an hour before slicing.
Enjoy your Cranberry Walnut Sourdough Bread!