Name the drink, or the 1978 radio series and 1979 book that originally introduced it.
Take the juice from one bottle of that Ol' Janx Spirit.
Pour into it one measure of water from the seas of Santraginus V.
Allow three cubes of Arcturan Mega-gin to melt into the mixture (it must be properly iced or the benzene is lost).
Allow four litres of Fallian marsh gas to bubble through it.
Over the back of a silver spoon float a measure of Qualactin Hypermint extract, redolent of all the heady odours of the dark Qualactin Zones.
Drop in the tooth of an Algolian Suntiger. Watch it dissolve, spreading the fires of the Algolian suns deep into the heart of the drink.
Add an olive.
The drink is notably described as like having your brain smashed out by a slice of lemon wrapped round a large gold brick
Pan-Galactic Gargle Blaster (Hitchhiker's Guide to the Galaxy)