Kombucha is a traditional fermented drink made of black tea and sugar. It contains a variety of vitamins, minerals and enzymes and has been prized by traditional cultures for its health-promoting properties.
More specifically, Kombucha is a sweetened tea that is fermented with a SCOBY (a symbiotic colony of bacteria and yeast) to become a nutrient-rich beverage. The fermentation process takes 7-12 days depending on temperature and the strength of the SCOBY. The SCOBY consumes over 90% of the sugar during fermentation, resulting in a low-sugar finished product. This process is similar to what would happen in sourdough bread or milk/water kefir.
Once a very obscure drink, Kombucha is now a popular beverage.