The industrial production of vitamin C has long relied on fermentation processes, particularly via the conversion of d-sorbitol into 2-keto-L-gulonic acid (2-KLG), a direct precursor of ascorbic acid.

Here's a practical guide to getting started at home. Bokashi composting is a bit different from other methods in that it's actually a fermentation system. (Bokashi is a Japanese word for "fermented ...