A sweet orange drink of the First Federation, offered by the alien commander Balok to his guests from the Enterprise once his test of their intentions was over.
Tranya is introduced at the end of the episode The Corbomite Maneuver. After threatening the Enterprise with destruction, Balok's small pilot vessel appears to break down, and Kirk beams across with McCoy and Lieutenant Bailey to offer help.
They find that the fearsome face on the viewscreen was a puppet. The real Balok is a small, childlike being who has been testing whether the humans were truly peaceful. He welcomes them warmly and pours out cups of tranya, hoping they will enjoy it as much as he does.
Bailey stays behind for a time as an envoy. The drink is seen again in Deep Space Nine, where it is among the beverages available at Quark's bar.