Beyond the Label Hennessy X.O Cognac is intense, rich, and full-bodied. It is a blend of more than one hundred individual eaux-de-vie, or aged cognacs, some of which were aged up to 30 years. Well-balanced on the palate, its strong, predominantly peppery flavors attest to its long aging. (X.O stands for “eXtra Old”) Complex and persistent, enjoy it on the rocks, with a splash of water or neat in a snifter. California Residents:Click here for Proposition 65 WARNING. For adults of legal drinking age. Please drink responsibly.