Special equipment: An instant-read thermometer and an electronic or balance scale
In a large mixing bowl, combine the pate fermentee and water and, using your hands, break up the dough into the water.
In another bowl, whisk together the flour, yeast, and salt. Add the flour mixture to the pate fermentee mixture and mix by hand until firm and cohesive, about 3 minutes. Allow dough to rest for 10 minutes.
Turn the dough out onto a lightly floured work surface. Knead the dough until very elastic and smooth, about 10 to 15 minutes. Take the dough's temperature. It should be at 78 degrees F. Transfer the dough to a large bowl and cover with plastic wrap (the plastic should not touch the dough). Place the bowl in a warm place (about 75 to 78 degrees F.) and let rise for a total of 1 hour and 45 minutes. After the first 45 minutes, fold the dough and turn it over in the bowl. (It will somewhat deflate the dough, but it is gentler than what's commonly referred to as "punching down.")
Let the dough rise, undisturbed, for 1 hour more. (The dough will rise considerably at this point.)
Turn the dough out onto a lightly floured work surface. Press the dough gently into a rectangle, to degas it.
In a large bowl, whisk together the flour, salt, and yeast. Add the water and, using your hands, mix until incorporated, about 3 minutes. (Alternatively, mix in a mixer on the lowest setting possible.) Cover bowl with plastic wrap and put in a warm place (about 75 degrees F.). Let the dough ferment for 1 hour. Take the dough's temperature. It should be at 75 degrees F.
Refrigerate the dough at least 10 hours and up to 36 hours. When ready, it will be roughly doubled in size and have a fine network of filaments and holes. Make this recipe the night before you mix the dough.
Recipe courtesy of Christy Timon & Abram Faber, Clear Flour Bread, Brookline, MA