If you've had shawarma, you've probably had these. They're a great way to learn fermenting and use food waster (beet water) as a feature ingredient! Awesome in a sandwich, especially if it has hummus or other beans!
A Russian fermented tonic of either rye bread or vegetables, kvass, can be used to make cold nutritious soups. Click for the pravda about kvass beet borscht, kvass mixed vegetable soup, and a cucumber melon soup enriched with kvass, da?