What is the primary ingredient in vin jaune?

Vin jaune is primarily made from Chardonnay grapes, which are grown in the Jura region of France. This unique wine undergoes a very specific process that includes a distinctive aging method known as "solera," where it is aged in a barrel under a layer of yeast, referred to as "voile." This slow aging process allows the wine to develop complex flavors and a distinctive nutty character that sets it apart from more typical Chardonnay wines.

The use of Chardonnay is crucial because its characteristics lend themselves well to the vin jaune style. The grape’s natural acidity and ability to express terroir are vital to achieving the unique profile of vin jaune. The other options, such as Riesling, Cabernet Sauvignon, and Merlot, are not typically associated with this particular type of wine and do not undergo the same aging process that defines vin jaune.