Mix the buttermilk and water. Mix rye flour, sugar, yeast and 150 ml buttermilk / water mixture into a pre-dough and let rise in a warm place for approx. 2 hours.
Knead the rest of the flour, salt and buttermilk / water mixture into a firm dough, I do it with the food processor in about 10 minutes. Let the dough rest for 45 minutes and do not knead any more.
Carefully divide into 4 equal pieces, pull them out to a length of approx. 20 cm and place them on a baking sheet as snails. Cover and let rise for approx. 50-60 minutes, the dough pieces should rise to about twice their size.
Dust with a little wheat flour and bake in the preheated oven at 250 ° (top / bottom heat) on the lower rail for 8 minutes, then at 220 ° for another 15 minutes.