The Nar Shaddan were an alien species in the Delta Quadrant. They considered Falah nectar a delicacy, to the point that to refuse it might be considered an insult.
In 2377, an away team from the Federation starship USS Voyager participated in succesful trading negotiations with the Nar Shaddan over a period of five days. The away team consisted of Commander Chakotay, Ensign Harry Kim and Neelix; Kim considered this away mission the worst during his time on Voyager. (VOY: "Workforce")
The name could be an homage to Nar Shaddaa, the name of an infamous moon in the Star Wars universe. It orbits the Hutt's homeworld and is often used by smugglers. Episode writer Bryan Fuller has introduced Star Wars terms on other occasions.