Earlier quoted context omitted.
I had a buddy that created a spreadsheet of various foods and their micro/macro nutrients. He's an engineer and wanted to engineer his diet to cover every deficiency in the minimal amount of food possible. He told me that potatoes were almost the perfect food if you could magically reduce the amount of glucose you took from them.
Is there some form of fermented potato dish / treatment? Apparently yes: https://drdavisinfinitehealth.com/2018/02/fermented-raw-pota... (One of several results on search. I've no idea on merits / validity here.)
I also drink highly fermented potatoes, that's called Vodka!