This bread is some of the best! For reliable results, weigh your ingredients with a kitchen scale.
In a large mixing bowl, combine the flour, water, salt, starter, and 2/3 cup (100g) of the pumpkin seeds until a soft, shaggy dough forms (make sure all of the dry flour gets incorporated into the dough). Cover with a damp tea towel and allow this to rest 20-30 minutes.
Pull each pre-shaped loaf into a square again, and stretch and fold the corners into the centre again. Roll the dough into a loaf shape, and pat the outside with a clean paper towel dipped in water, to make the surface of the dough sticky. Put the remaining pumpkin seeds (1 cup or 150g) onto a large plate, and roll the sticky dough in seeds to cover it. Place the loaf smooth side down into a lightly floured banneton basket or bowl* lined with a tea towel. Repeat with the second loaf.
Sprinkle the tops with more pumpkin seeds, if desired, and cover with a bit of plastic wrap (optional). Fold the towel over top, and place the loaves immediately into the refrigerator. Allow to rest in the fridge until the next morning.
The next morning, place a dutch oven into a cold oven, and preheat to 425 degrees F. Set the timer for 15 minutes.
Uncover the bread and remove the plastic wrap. Turn out onto a sheet of parchment paper, and score with a sharp knife or razor blade (one or two slashes is good for this recipe).
Once the dutch oven has been in the oven heating for 15 minutes, take it from the oven, remove the lid, and lift the bread into the hot dutch oven by the parchment paper sheet. Cover, and return to the oven for 35 minutes.
*To use a bowl instead of a basket, the perfect size for these loaves is a bowl that measures about 7 inches across the top and about 4 inches deep.