Kefir — milk fermented by kefir grains (a polysaccharide matrix housing bacteria and yeasts in a symbiotic community) — produces a beverage that is simultaneously sour (from lactic acid), slightly alcoholic (from yeast fermentation), and mildly carbonated. The kefir whey (the liquid strained from kefir cheese) is one of the most useful fermentation by-products — a complex, tangy, proteinaceous liquid that can be used as a lacto-fermentation starter, a meat tenderiser, or a sour liquid component in cooking.
- **Kefir grains:** The physical grains (cauliflower-like, gelatinous) contain Lactobacillus and Leuconostoc bacteria alongside Saccharomyces yeasts — the combined microbial community produces a more complex fermentation than any single organism. - **Temperature:** 20–25°C for 24–48 hours. The fermentation is faster in warmer conditions. - **The ratio:** Kefir grains + fresh milk — the grains are removed and reused after each batch. - **Kefir whey applications:** Added to bread doughs (its lactic acid strengthens the gluten network while producing sourdough-adjacent flavour); used as a meat tenderiser (its proteases partially hydrolyse the surface proteins); used as a fermentation starter for lacto-fermented vegetables.
Noma Fermentation