Kandora champagne was a variety of champagne.
In 2371, Quark gave a bottle of 2368 Kandora champagne as a gift to Major Kira Nerys. He said, it was a very good vintage. (DS9: "Meridian")
In 2374, Dr. Julian Bashir and the other genetically-engineered toasted with a bottle of Kandora champagne after Captain Benjamin Sisko had agreed to take their analysis of the Dominion War situation to Starfleet Command. (DS9: "Statistical Probabilities")
Given that the bottle contained the seal of the Federation, it was probably produced within it.