I think what you are referring to is the Bokashi bucket method. This is a useful composting method. It is basically anaerobic fermentation in a closed bucket with an added inoculant which contains about 10 microorganisms which “control” the fermentation process in the bucket. The inoculant is called EM-1. I especially appreciate this method in the winter months as it can be kept indoors.
These webpages describe the method, step by step: https://bernalilloextension.nmsu.edu/mastercomposter/bokashi.html”>Bokashi Overview.
Kits are available on Amazon or at https://www.teraganix.com/collections/bokashi-1
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