Dissolve the yeast in the water and let it swell briefly. Put the remaining ingredients in a food processor with a dough hook, add the yeast water and knead well until a smooth dough is formed. If necessary, knead again by hand. Let rise in a floured bowl for about 1 1/2 hours.
Divide the dough into 24 g portions, roll them into oval dough pieces and let them rest for another 20 minutes, covered.
In the meantime, prepare the lye. Bring 1 liter of water to the boil and add the baking soda. Warning, that can foam. Preheat the oven to 180 ° C fan oven.
Let the dough pieces float in the lye for about 40 seconds, turning them over once, removing them with a slotted spoon and placing them on a baking sheet with baking paper. Cut the dough pieces in half with scissors.
Put the baking sheet in the middle of the oven and bake the dough for about 20 - 30 minutes. The time may vary slightly depending on the oven and the size of the dough pieces.