Amber-brown beverage (pronounced "tar-KAY-lee-un").
Tarkalean tea is widely popular on DS9 and Bashir's favorite drink during his first year at the station. It is available at both Quark's and the Replimat, where the doctor was drinking it when Garak first introduced himself.
During Bashir's coma hallucination, he saw the tea steadily pouring from the Replimat replicator. The tea is now on file in the U.S.S. Defiant's replicators: Bashir ordered some with sweet brescha fruit in the Mess Hall. He likes it extra sweet, but Kira drinks hers not too sweet.