Multiple realities
(covers information from several alternate timelines)
Prometheus nectar was a variety of nectar from Prometheus.
In 2255 of the alternate reality, the Shipyard Bar in Riverside, Iowa, on Earth, offered this beverage as a special item on its menu. (Star Trek)
In 2365, Guinan offered Wesley Crusher this nectar while he considered what life would be like away from his mother after she left the USS Enterprise-D in 2365. (TNG: "The Child")