"Vegetable ferments" refers to the process of using bacteria and yeast to convert vegetables into a fermented product, such as sauerkraut or kimchi. This process preserves the vegetables and adds a tangy or sour taste to them. Full definition
The Europeans also still enjoy many types of foods that contain probiotics including milk products as well as vegetable ferments. (probiotics-help.com)
I've tasted all kinds of vegetables fermented in this fashion, and they've all been uniquely sensational. (bonappetit.com)
The book covers vegetable ferments such as sauerkraut, kimchi, and sour pickles; bean ferments including miso, tempeh, dosas, and idli; dairy ferments including yogurt, kefir, and basic cheesemaking (as well as vegan alternatives); sourdough bread - making; other grain fermentations from Cherokee, African, Japanese, and Russian traditions; extremely simple wine - and beer - making (as well as cider -, mead -, and champagne - making) techniques; and vinegar - making. (kombuchakamp.com)