The Master Recipe: Boule (Artisan Free-Form Loaf)

lukewarm water 1 1/2 Tablespoons granulated yeast (1 1/2 packets) 1 1/2 Tablespoons kosher or other coarse salt 6 1/2 cups unsifted, unbleached, all-purpose white flour, measured with the scoop-and-sweep method cornmeal