Alvanian brandy was a type of brandy.
In 2318, Jas Holza drank several glasses of Alvanian brandy after he learned he would play the lead role in the Bajoran people's official first contact with the Cardassians. (TLE - Terok Nor novel: Day of the Vipers)
In 2355, a fellow bar patron Kyle Riker had been talking to in a bar in San Francisco ordered an Alvanian brandy from Inis, a Deltan bartender. (ST - The Lost Era novel: Deny Thy Father)
Alvanian brandy was popular beverage in Quark's on Deep Space 9's Promenade. (ST reference: Star Trek Cookbook)
In 2372, Julian Bashir was paid for treating a patient with a crate of Alvanian brandy. Bashir found it undrinkable and gave all of the bottles to Quark. (DS9 episode: "Body Parts")