[Source] Rancor sauce was a sauce used for seasoning of noodles. For the human and Mon Calamari species, it was the taste that was weird just to imagine it. When they came in contact with Sakhet of the Rebel Alliance in Sakhet's noodle shop on the planet Denon, Luke Skywalker and Nakari Kelen were ordered to order "Rancor sauce cliff of Corellian buckwheat noodles" as a password.