Take a clean pot and add water, rye flour and wheat flour. Stir together with a clean spoon. Scrape the wall of the tray clean. Put the lid (loosely) on the tray and leave the mixture at room temperature for 24 hours.

You may already see some bubbles, but that is not necessary. The mixture can also smell something, does not matter. This unpleasant odor disappears during the following days.

Stir everything together with a clean spoon. Scrape the wall of the container with a pancake. Put the lid (loosely) on the tray and leave the mixture at room temperature for 24 hours.

Stir everything together with a clean spoon. Scrape the wall of the container with a pancake. Put the lid (loosely) on the tray and leave the mixture at room temperature for 24 hours.

The mixture must now be active and doubled in volume. After 24 hours it can be reduced to the level after the diet of day 3. If the mixture does not double, repeat day 3, if it doubled you continue with the specified quantities.

Stir everything together with a clean spoon. Scrape the wall of the container with a pancake. Put the lid (loosely) on the tray and leave the mixture at room temperature for 24 hours.

If the mixture has doubled in volume (or even tripled) in the last 24 hours, your starter is almost ready for use. From now on you only feed / change the mixture with water and wheat flour.

Stir everything together with a clean spoon. Scrape the wall of the container with a pancake. Put the lid (loosely) on the tray and leave the mixture at room temperature for 24 hours. If the mixture can double or triple in day 7 in 6 - 8 hours, your dese is ready for use. You can also change the mixture from day 5 every 12 hours with the above ingredients to obtain an active desem that consists of only wheat flour.

If you need more of it, you can give it more nutrition by, for example, replacing 100 grams of the desem with 200 grams of water and 200 grams of wheat flour (1: 2: 2). You can also enter / refresh the part that you would otherwise throw away.