This is a wine that is made from unfermented grape juice (from Chardonnay grapes) and wine must which has been boiled to reduce the volume by 50%.
The wine is then fortified with a marc which has been made on the premises to gain an alcohol level between 16% to 22% which is required for acceptance by the appellation. The resulting wine must then be aged in old oak barrels for at least a year before being released. The wine can be red, white or rosé depending on the grapes used.