Kombucha is a drink that is made by fermenting sugared black or green tea. A special culture of yeast, fungus, and bacteria, known as a “scoby” – a symbiotic culture of bacteria and yeast — is added to the tea. The scoby is usually round and jelly-like, and looks like a mushroom cap.
The scoby starts the tea’s fermentation. Over time, the bacteria grow, and remove much of the sugar in the drink.