Another Gift From Russia

Another delicious, refreshing and salutary beverage consumed in Russia is chainyi grib, known in the US as kombucha, made from tea, sugar and a culture or "mushroom." Actually, fermented tea is consumed throughout Japan, Poland, Bulgaria, Germany, Manchuria and Indonesia as well as Russia. Other names for the drink are teeschwamm, wunderpilz, hongo, cajnij, fungus japonicus and teewass.
The tea fungus or culture is a symbiotic combination of vinegar-producing bacteria (Acetobacter sp.) with at least two yeasts. The fungus can only form when the Acetobacter and yeasts are present together. When Acetobacter is used alone, gas is produced and the film or culture does not form. The culture transforms sweetened black tea into a slightly fizzy, sour drink, redolent of cider, via a combination of acetic, lactic-acid and glucoronic fermentation. In the process, virtually all the sugar and caffeine are transformed into other compounds.
Kombucha is safe and healthy when prepared according to directions. Bring 3 quarts of water to a boil, remove from heat, add 1 cup of white sugar and steep with 4 bags of organic black tea. To avoid contamination, the sweetened tea should then be placed in a clean, clear glass bowl and the "mushroom" placed carefully on top. Place a crisscross of masking tape across the bowl and cover with a clean towel. Place in a warm, protected spot for about eight days until the beverage becomes suitably acid.
Some people claim that kombucha is not safe, but when reasonable care is taken, "you’re more likely to find contamination in a cup of coffee than in a cup of properly prepared kombucha," according to Dr. Samuel Page of the FDA. Of course, if the kombucha develops mold, you should not drink it—just as you would not consume any food that developed mold.