Russia China Acidulated mongolian drink obtained by a symbiotic yeast and bacteria culture in a sweet medium : tea + white sugar or honey and grape juice. Kombucha or manchurian mushroom is an association of bacteria and yeast. It's traditionaly prepared in Russia or China with sweetened green or black tea. Fermentation would give a sparkling drink containing organic acids, enzymes, B group vitamins, cafeine, etc. This drink is traditionaly known in several countries as a popular remedy for digestion problems. Some commercialized products are pasteurized or comprise preservatives, destroying thus the benefical bacteria and losing the hypothetic therapeutic effect.