Place your whole, unpeeled potato in a pot of cold water. Bring the water to a boil and cook until the potato is tender and soft all the way through. Once cooked, drain the potato and let it cool
Once the boiled potato has cooled enough to handle, peel away the skin and grate it using a small grater.
In the bowl of the stand mixer, combine 50 g of flour, 1 teaspoon of sugar, 7 g of dried yeast, and 50 ml of warm water. Using a spoon, stir the ingredients together until they are fully combined. Set the bowl aside in a warm place for about 30 minutes.
Add the remaining flour, the salt, your grated potato, and the remaining 250 ml of warm water. Knead it with the dough hook for about 7-8 minutes on medium speed.
After kneading, form the dough into a ball and place it back into the bowl. Cover the bowl tightly with plastic wrap and let the dough rest for about 1 to 1.5 hours, or until it has doubled in size.
Grease your work surface with a small amount of oil and turn the doubled dough out onto the prepared surface. Using your hands, gently press and roll the dough into a rectangular shape about 1 cm thick.
Take one of the long ends and fold it over to cover about two-thirds of the dough. Then, take the opposite end and fold it over the top of the first fold. Finally, fold the entire length of the dough in half.
Cover the folded dough with plastic wrap. Place it back in a warm, draft-free spot and let it rise for another 30 minutes.
Grease your hands and your work surface once more. Gently press the dough down to release some of the air, then roll it out by hand into a rectangular shape.
Tightly roll the dough lengthwise into an oval or torpedo shape. As you roll, be sure to keep the dough taut.
Transfer your shaped dough to a baking dish or Dutch oven that you've lined with parchment paper. Place the lid on the baking dish and let the dough sit for a final 30 minutes.
Pour 50 ml of water directly into the bottom of your baking dish, making sure it's under the baking paper where your dough is resting.
Place the lid on your baking dish and slide it into the preheated oven. Bake for 30 minutes at 230°C. Reduce the oven temperature to 200°C (400°F) and continue to bake for another 10 minutes with the lid still on.
Remove the lid from your baking dish. Bake at 200°C (400°F) for an additional 10 to 12 minutes, or until the crust is a deep, golden brown.
Take the bread out of the oven and use a pastry brush to lightly brush the top of the loaf with water.
Transfer the bread to a wire cooling rack and let it cool completely.
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Notes
Make sure your boiled potato is grated or mashed until it is completely lump-free. Any small chunks of potato can prevent the gluten from developing properly around them, leading to a denser, uneven texture in your finished loaf.Make sure your water is warm, not hot (around 40°C), as water that is too hot can kill the yeast.Freshly baked bread is best enjoyed within a day or two, but this potato bread stays moist and delicious for much longer than a typical loaf.