The first thing I do is measure the rye flour, sift it into a large bowl.
Then sift the white flour into another bowl.
Then, from 250 grams of white flour, I collect half a cup of sourdough flour. And pour the rest into a bowl with rye flour.
So, the leaven. In 3/4 cup of warm water (taken from 500 ml – two glasses), pour a teaspoon of sugar, add 2 teaspoons of molasses, flour (half a cup), 40 grams of live yeast (I usually add 30, but this is my whim. In the original recipe – 40 grams).