Mix the two types of flour and the salt, then add the sourdough and yeast. Now slowly add the lukewarm water and knead vigorously, but the dough must not become too firm.
Then let the dough rise to double the amount and knead again, then shape into a roll and make a ring out of it.
Dust this ring with rye flour.
Place the bread on a baking sheet lined with baking paper and place in the oven at approx. 200 ° C for 50 minutes on the middle rack.