In a large bowl, mix your starter, water, and flour until a shaggy dough forms. Add salt and mix until just combined.
Cover the bowl and let the dough rest. Over the next few hours, perform a few simple stretch-and-folds to help build structure. These take less than a minute each.
Let the dough rise at room temperature until it looks puffed and airy. This can take anywhere from 4–8 hours depending on your kitchen.
Gently shape the dough into a round loaf. Place the dough in the fridge overnight. This step improves flavor and makes baking easier, but you can skip it if needed
Bake at 375°F in a preheated Dutch oven for 45 Minutes, then finish uncovered for 15 minutes or until golden brown.