Icoberry juice is a beverage, a juice made from puréed or pressed icoberries.
Jadzia Dax enjoyed icoberry juice, although it actually made her Trill spots itch due to an allergic reaction. (DS9 episode: "Let He Who Is Without Sin...")
According to Quark, the Breen like icoberry juice served frozen solid, in keeping with the low temperatures the Breen prefer. (DS9 reference: Legends of the Ferengi)