How to Prepare a Proper Green Fairy

Place a sugar cube on top of a slotted absinthe spoon, then place the spoon on a proper absinthe glass containing shot of absinthe.

Drip ice-cold water over the sugar cube and down into the absinthe, until the mix is approximately 1 part absinthe and 3 to 5 parts water. Most absinthe will louche (turn cloudy).

There is a Bohemian alternative that involves setting the absinthe on fire. 

Take a look at more absinthe cocktails.