A number of environmental and weapons treaties, as well as laws of physics, so far prevent it from being mixed on planets such as Earth; but this has not stopped a variety of shoddy imitations from springing up. The original and best recipe, however, is as follows:
Take the juice from one bottle of the Ol’ Janx Spirit.
Pour into it one measure of water from the seas of Santraginus V – oh, that Santraginean seawater. Oh, those Santraginean fish!
Allow three cubes of Arcturan Mega-gin to melt into the mixture (it must be properly iced or the benzine is lost).
Allow four liters of Fallian marsh gas to bubble through it, in memory of all those happy hikers who have died of pleasure in the Marshes of Fallia.
Add an olive.
Drink… but… very carefully…