Wikipedia
Kvevris ( ; also known as churi in Western Georgia) are large earthenware vessels used for the fermentation, storage and ageing of traditional Georgian wine. Resembling large, egg-shaped amphorae without handles, they are either buried below ground or set into the floors of large wine cellars. Kvevris vary in size: volumes range from 20 litres to around 10,000; 800 is typical.
Archaeological excavations in the southern Georgian region of Kvemo Kartli (notably at Dangreuli Gora, Gadachrili Gora and in the village of Imiri) uncovered evidence of grape pips and kvevris dating back to the VIth millennium B.C.
The villages of Atsana in Guria; Makatubani, Shrosha, Tq'emlovana and Chkhiroula in Imereti; and Vardisubani in Kakheti are traditional kvevri-making areas. Artisanal families have passed down the knowledge of this ancient handicraft through the generations. The clay used to manufacture a kvevri must be carefully chosen, as its characteristics will influence the wine's mineral content.
The process of making wine in kvevris involves pressing the grapes and then pouring the juice, grape skins, stalks and pips into the kvevri, which is then sealed. The juice is then left to ferment into wine for at least five to six months before being decanted and bottled. The mash of pips, skins and stalks (called chacha in Georgian) is then removed and distilled into brandy. The empty kvevri is then washed, sterilized with lime and re-coated with beeswax, ready to be filled again.
Traditional Georgian wines do not represent a uniform style. A common feature is that their vinification is carried in kvevri completely buried in the ground, so that even the outlet neck of it remains below ground level. The most unusual and archaic, out of the traditional Georgian wines are of course white Kakhetian wine ( also known as orange or amber wine), macerated for several months with the skins, seeds and stems of grapes in buried kvevri. “Kakhetian method" is like an extreme current of Georgian wine making tradition, while the moderate faction represents the so-called "Imeretian method". From “Kakhetian method, it differs in amount and quality of the chacha used. The Imeretian method uses only part of the chacha, roughly one-tenth, and stems are not used at all. The rest of the production process proceeds in basically the same. The result is a wine much closer to European standards, not as tannic as the traditional Kakhetian wine, although in this case a long maturation in kvevri gives them the undisputed Georgian stigma. Intermediate place between the Kakhetian style and Imeretian style represents the traditional white wine from province Kartli (Central Georgia), where the one third of chacha with stems is added to kvevri.
In the past, kvevris were also used for storing brandy, grain, butter, cheese and a variety of other perishable foodstuffs, although in Georgia they have always been primarily used for wine-making. Large ceramic storage vessels such as these are made in many countries, but only Georgia, Spain (vino de tinaja, vino de pitarra) and Portugal (vinho de talha) use them for wine-making.
Wine-makers who use kvevris claim that their wine is stable by nature, rich in tannins, and that it does not require chemical preservatives to ensure long life and superior taste. The tannins found in kvevri wine limit protein content and prevent turbidity.
Since the Russian market for Georgian wine has dwindled to a trickle, Georgia has revived this ancient method of wine-making and is exciting interest around the world. Various commercial wineries in Georgia export kvevri wines abroad, and some wine-makers in Europe and America have taken to making their wine in kvevris.
In 2013, UNESCO added the traditional Georgian method of making wine in kvevris to its list of intangible cultural heritage.