In a large bowl, add the yeast and lukewarm water and stir. Allow to sit for 2 minutes. Add the flour and salt, stir with a wooden spoon to blend. Cover the bowl with plastic wrap and allow to rest for 8 hours, 14-18 hours preferably, at room temperature.
After the dough has rested and risen, flour a work surface and turn out the dough. Flour lightly and fold the dough over itself twice. Cover with a clean kitchen towel and rest 20 minutes.
Gently shape into a ball, dust with cornmeal and cover again with the kitchen towel or place in a bread proofing basket for 1-2 hours.
Heat oven with 5.5 qt dutch oven inside to 475º F. Gently place the dough, seam side up on a piece of parchment paper (not waxed paper) and lower into the hot dutch oven. Cover and bake 30 minutes. Remove the lid and continue baking 15-20 minutes longer. Remove and allow to cool for 20 minutes or more before slicing.