160 grams bubbly, active start
230 grams warm water, preferably filtered
400 grams bread flour or unbleached all purpose flour
7 grams fine sea salt or Kosher salt
Fine ground cornmeal or rice flour for dusting
MAKE THE DOUGH
Whisk the active start and water together in a large bowl. Add the flour and salt. Squish everything together with your hands or use a mixer until all of the flour is absorbed. Let rest for about 10 minutes (autolyse) and then continue to knead for 10 minutes. Now the dough needs to rise until it doubles in size (bulk rise).
Cover the bowl with wrap or a very damp kitchen cloth. Let rest in a warm spot to rise. The dough is ready when it no longer looks dense and has doubled in size. This can take anywhere from 3-12 hours.
CUT & SHAPE THE DOUGH
Divide your work surface in half; lightly flour one side (for cutting) and leave the other half clean (for shaping). Place dough on to the floured section. Cut the dough in half to make 2 loaves or leave it whole for a large single loaf. To shape, use a bench scraper to move your dough to the non-floured section. shape into a round.
SECOND RISE
Coat the bottom of the basket with flour. Place it into a proofing basket and cover for a shorter rise, about 30 minutes.
BAKE THE DOUGH
Preheat oven to 450 degrees with dutch oven inside. Invert dough from proofing basket onto floured parchment. Transfer to dutch oven and cover with lid. Bake for 23 minutes with lid on. Remove lid and continue to bake uncovered for additional 5-8 minutes until deep, golden brown. Remove from oven and allow to cool.