Glenmorangie Nectar D'Or goes from bourbon barrel aging to finishing in used sauternes casks. Sauternes is a sweet, delicate French wine, usually served as a dessert wine, made from Semillon, Sauvignon Blanc and Muscadelle grapes that have been affected by Botrytis cinerea, the "noble rot." Thus, the characteristics it imparts to the 10-year-old Scotch during the two-year extra aging process are unique.