Feed Starter equal portions starter, flour, water (approximately a half cup each or 50 grams)
Repeat feeding 3 times every 12 hours until the starter is bubbly, doubles in size, and floats in water
When the starter is ready, place water into a large bowl and mix starter into the water to mostly dissolve.
Add salt to the starter water and stir.
Add flour to the water and stir until fully incorporated. The dough should be wet.
Let dough sit covered with clean dish cloth for 30 minutes.
Stretch and fold the dough every 30 minutes for about 2 hours.
Place the dough, covered with saran wrap, into fridge for 12-24 hours.
Remove dough from fridge and allow to come to room temperature for 2 hours.
Remove the dough from the bowl onto clean counter top and split dough in half using bench scraper.
Form rounds with each half of dough and cover with clean dish cloth for another 30 minutes.
Create tension in the dough by shaping each round into a ball and placing into a floured proofing basket or bowl, seam side up.
Cover dough with clean dish towels and return to refrigerator for 2 hours until ready to bake.
Preheat the oven to 450 45 minutes prior to baking, with dutch oven and cover inside.
When oven is ready, remove one dough bowl from the refrigerator. Cover with parchment, and flip the dough onto the parchment paper.
Score the dough using a sharp knife. Salt the bread with coarse Kosher salt.
Transfer the dough using the parchment paper to the dutch oven and cover the dutch oven.
Place dutch oven, covered, into the oven. Bake at 450 for 35 minutes.
Remove the cover off the dutch oven at 35 minutes, and bake uncovered another 20 minutes.
Check the color of the bread to be sure it's browning well. Then turn the oven off, and open the oven door a crack for 20 more minutes before removing from the oven.
Wait one hour before cutting into bread.