Screenshot from Donna Schwenk's video
featured on her home page
How to culture vegetables? How to make Kefir? An excellent, very informative website with an on-line store and a free ebook and more is Donna Schwenk's Cultured Food Life. I found her 17 minute video (on her home page) well worth watching. I can say that Kefir and yoghurt has done the same for me and the book she mentions, Nourishing Traditions, is one I keep handy.