¼-½tspbaking soda, added during kneading and shaping, if desired(see notes)***
The night before you're ready to make the dough for your bread, discard all but about ⅓ of your starter and feed it with 100 grams of whatever flour you've been using and 100 grams of water (or a splash or two more to make a thick pancake-like batter). This will vary depending on the size of your starter, but your goal is to have enough active (mature and ripe) starter to equal 140 grams when making the dough the next day.
The next morning, in the bowl of a stand mixer or a large bowl, whisk together the dry ingredients and then add the wet ingredients (including 140 grams of the ripe starter), beating on low until well combined. Increase the speed to medium high and mix for 5 minutes. If mixing by hand, mix vigorously for 5-7 minutes.
Cover the dough and allow it to rise in a warm, draft-free area until doubled in size, about 3-4 hours (sourdough always takes longer to rise). Place the risen dough in the refrigerator overnight.
The next day, remove the dough from the fridge and turn it out onto a well-floured surface. If using baking soda, add ¼-½ tsp to top of dough and begin kneading dough until smooth.
Form into a round and turn over into a floured banetton basket or in a floured tea towel-lined bowl, or shape into a round on a square of parchment paper. Cover and allow it to rise until puffed and noticeably larger, but not doubled in size, about 2-3 hours.
Towards the end of the rising time, place Dutch oven with lid (or baking steel or stone and shallow pan) into the oven and preheat it to 500° F for 30 minutes.
When the dough has finished rising, carefully flip it out onto a sheet of parchment paper and slash (score) it with a lame or sharp serrated knife. Open the oven door, carefully place the loaf in the Dutch oven, parchment and all, and replace the lid. Alternatively, slide the loaf, parchment and all, onto a baking steel or stone and pour one cup of hot water into shallow pan. Immediately close the oven door and drop the temperature to 450° F. Bake the bread for 40 minutes. If using a Dutch oven, remove the cover and continue to bake for another 20 minutes. If using baking steel or stone, bake the bread for a full 60 minutes.
Remove the bread from the oven and allow to cool before slicing.
**Starter is mature when it predictably rises and falls. Ripe starter is starter that's been fed within the past 12 hours. ***Using a very small amount of baking soda gives the bread a more open crumb. If using, make sure to fully blend it into the dough before baking. DISCLAIMER: The reason I created my own flour blends is because I could not obtain the results I wanted with flour blends that were available in stores, online, or from other gluten free bloggers. My recipes have been developed to be used with my own bread flour blend that I created after painstakingly testing for, in some cases, YEARS to develop what I believe to be a superior gluten free bread like no other. If you do not use my gluten free bread flour blend for this recipe, I cannot speak for the results you will obtain. While store bought blends may give you a satisfactory result, they may NOT give you the results intended in my recipe.