Let the flake-seed mixture swell with the mashed potatoes with 50 ml of warm water and the salt for 4 hours.
Puree the potatoes with the buttermilk / yogurt. Then knead the sourdough, the flour, the oil, the maple syrup, the mashed potatoes and the swollen seeds into a dough with the food processor, but not for too long. The dough should have the consistency of a batter. Then let the dough rest in one place for about 30-40 minutes.
With slightly damp hands, I usually use disposable gloves, as it is quite sticky, in 2 forms, I have 2 Ultras, in which it works great. Cover and let the dough rest in the bread molds for at least 2 hours.
Preheat the oven to 250 ° C, just before the bread comes into the oven, sprinkle with a few grains. When the bread is in the oven, turn it down immediately to 220 ° C, after 10 minutes to 200 ° C and after another 20 minutes to 180 ° for 30 minutes.
In between sprinkling the bread with water again and again.
My oven has a hydro program, so you don`t have to do that.
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