ThanksOh ok, why not, since it's alive again...
What you're referring to is priming with "Speise" (sometimes calles Gyle, i.e. unfermented wort). But you don't have to find the right amount by trial and error. There are calculators available, like this one:
https://www.brewersfriend.com/gyle-and-krausen-priming-calculator/
Things have changed since I brewed my first batch in 1994 that way. its great to have that calculator on hand.
That answer is informative and well apricated.
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