Final answer:
In Maury, Roussillon, the primary grape used for making vin doux naturels is Grenache Noir. Other varieties such as Grenache Blanc, Grenache Gris, and Macabeu can also be part of the wine's composition. These wines are sweet and fortified, with a high alcohol content and a rich flavor.
Step-by-step explanation:
The grape used in Maury, Roussillon for making vin doux naturels is primarily Grenache, especially Grenache Noir, although other grape varieties such as Grenache Blanc, Grenache Gris, and Macabeu may also be used in the production of these sweet natural wines. Maury is one of the appellations in the Roussillon wine region of France, which is renowned for these fortified wines. The process involves halting fermentation through the addition of a grape spirit, which preserves some of the natural sweetness of the grape juice while raising the alcohol content, resulting in a rich and sweet wine with a distinctive flavor profile.