Kvass
Rye bread kvass is a traditional Ukrainian non-alcoholic fermented drink that has been, and still is enjoyed by eastern Europeans for at least a thousand years. It is made of 100% rye bread or rye bread leftovers. It is made by a quick lactic fermentation, which results in a very tasty, slightly sour drink. It is also well known for its health properties and is a tonic for digestion, an excellent thirst quencher and, consumed after vodka, as an antidote to a hangover”. Very popular in the summer and often sold on the street from yellow tanks.