So when Bernd is ready we add the sourdough, about 200 grams, which makes 2:1:1 ratio. This again doesn't need to be exact.
Important: the sourdough will stick to the spoon just scrape it off with your finger, as much as you can, then DO NOT wash the spoon, but use a paper towel or something to wipe it off beforehand. That shit can create a blockage in the pipes. Actually you can wash it off if you discard the water in some other way (like you have a cesspool in the garden, or you want to pour the water into the neighbour's neck, or something).
Here comes the kneading. This is a long and tiresome process. The fact that it sticks to my hand so I can barely move my fingers, and that it is to small to press it to anything makes it frustrating. Anyway Bernd should work it somehow persistently it will get at least a bit better.
Sometimes I scrape the dough off from my hand with a buttering knife. Sometimes I poke the dough with my fingers, sometimes I pinch it, sometimes it needs to be scraped up from the bowl (I use a plastic leavening bowl, its a turd) because it will stick to it and every part of the dough needs to be kneaded. And we add even more bacteria from our sweaty palm (I always wash my hands with soap and warm water before touching the stuff, but I doubt it can be 100% clean).
After a while the dough becomes shiny, silky, almost makes us hear squeaky sounds. And by then we'll got enough of this bs for a lifetime or two so we can stop.
Let it rest for half an hour again.