Yes, zu Tisch is lovely 😍 We inly saw some episodes, but liked it a lot.
May I ask which kind of wheat sourdough you have? I have a livieto madre (festen Weizensauerteig) and it keeps so long.. I sometimes do not fresh it up/make new one for 2 weeks and its still very triebstark. I send photo on Instagram (its easier for me) from the focaccia dough... I made it from I week old livieto madre (its baking right now)