Pan Galactic Gargle Blaster

The Pan Galactic Gargle Blaster is an Alcohol served by Milo (Clara Oswald and the School of Death) on the Rosette of Sirius, it could apparently be used for medicinal purposes and could help cure sore throats.

Behind The Scenes
The Pan Galactic Gargle Blaster is a reference to The Hitchhiker's Guide to the Galaxy, which was written by Douglas Adams who worked on a number of Doctor Who episodes.