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Make the pre-ferment: Stir the starter into the water in a glass bowl. Add flour and stir until the ingredients are well combined. Cover with plastic wrap and let it ferment until it is full of bubbles, about 12 hours. If your kitchen is very warm and the pre-ferment is fermenting very quickly, place it in the refrigerator after 3 hours of fermenting. In the morning, remove it and allow it to come to room temperature 30 minutes to an hour before beginning the final dough

Prepare the Potato: For efficiency, you may want to prepare the potato the night before. Quarter it, then boil it in water to cover until it can be easily pierced with a knife tip, about 20 minutes. Drain and press the potato through a ricer or sieve to puree it and remove the skin. Store it in a covered container in the refrigerator. You will need only 1/4 cup puree.

Mix the dough:

By Hand: Use your hands to mix the flour and water into a rough, very wet dough in a large bowl. Cover the dough and let rest (autolyse) for 10 - 20 minutes.

Add the pre-ferment, honey, potato, and salt, and knead the dough until it is smooth, 5 - 10 minutes. It will start off feeling rubbery, then break down into goo; if you persist, eventually it will come together into a smooth, shiny dough. If you do not have the skill or time to knead it to smoothness, the bread will not suffer. This is a tremendously wet and sticky dough, so use a dough scraper to help you but do not add more flour, for it will ruin the texture of the bread.

By Stand Mixer: With your hands or a wooden spoon, mix the flour and water into a rough, very wet dough in the work bowl of your mixer. Cover the dough and let it rest (autolyse) for 10 - 20 minutes. Fit the mixer with the dough hook. Add the pre-ferment, honey, potato and salt and the mix the dough on medium speed for 15 - 20 minutes, or until very silky and wraps around the hook and cleans the bowl before splaterring back around the bowl. This dough is almost pourably wet.

Bulk Ferment: Place the dough in a container at least 3 times its size and cover tightly with plastic wrap. Let it ferment until doubled in bulk and filled with large air bubbles, about 4 hours. Using wet hands, turn the dough 4 times in 20 minute intervals, that is, after 20, 40, 60, and 80 minutes of fermenting, the leave the dough undisturbed for the remaining time. Do not allow this dough to over ferment or ferment to the point of collapse, for the flavor and structure of your bread will suffer.

Shaping and Proofing the Dough: Turn the fermented dough out onto a well floured work surface, round it and let it rest for 20 minutes. Sprinkle a couche or wooden board generously with flour. Slip a baking sheet under the couche if you are using one for support.

Sprinkle a generous amount of flour over the center of the ball. Push your fingers into the center to make a hole, the rotate your hand around the hole to widen it, making a large 4 inch opening. The bread should have about 12 inch diameter.

Place the dough smooth side down on the floured couche or board and dust the surface with more flour. Drape it with plastic wrap and let it proof until it is light and slowly springs back when lightly pressed, about 1 1/2 hours.

Preheat the Oven: Immediately after shaping the bread, arrange a rack on the oven's second to top shelf and place a baking stone on it. Clear away all the racks above the one being used. Preheat the oven to 450 degrees (230 C).

Baking the Bread: Unwrap the bread and flip it onto a floured peel or a sheet of parchment paper. Do not worry about damaging the bread as you handle it; it will recover in the oven as long as it is not over-proofed. Slash it with 4 radial cuts in the shape of a cross. Slide the loaf onto the hot baking stone and bake until it is very dark brown, 40 -50 minutes, rotating it halfway into the bake. Let the bread cool on a rack.