Warm up the drinking yoghurt, dissolve the chicken stock, sugar and dry yeast in it. Knead the flour with the yoghurt mixture above with a food processor (dough hook) to form a smooth dough. The dough ball weighs approx. 540 g. Let the dough rise for approx. 1 hour.
Divide the dough ball into 6 equal parts and roll out the 6 pieces of dough into double-conical snakes (at least 60 cm long). Shape pretzels and place on the baking sheet. Let rise for at least half an hour. Preheat the oven to 220 degrees bottom heat. Whisk the egg white with the water and salt.
Cut the six pretzels in the middle (see photo) and brush them twice with the caustic soda. Then sprinkle with the sesame mixture. Put in the oven and bake for 10 minutes at 220 degrees. Then reduce to 190 degrees. As soon as the pretzels turn yellow, take them out of the oven and brush them with the egg white mixture. Return to the oven and bake until light brown to brown.