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A wine unique to the Jura region of France. It is made exclusively from the Savagnin grape (which has similar properties to the Alsatian Traminer).
The grapes are picked late, and initially treated in the same way as other white wine; the wine is then sealed in barrels for a legal minimum of six years. In the barrel, a thin film, made of micro-organisms, forms on top of the wine - this is similar to the flor that forms during the production of Sherry.
When bottled, the wine is extremely long-lived, bottles staying in peak condition for a long as fifty years.