Vulcan brandy is a type of alcoholic beverage, a brandy that originates with the Vulcan civilization.
In 2377, Chakotay offered Tuvok a Vulcan brandy. (VOY episode: "Repression")
In 2381, a Ferengi bartender in the city of Vetruvis on Terix II offered Spock Vulcan brandy. Spock refused, preferring water. (ST - Typhon Pact novel: Rough Beasts of Empire)