Absinthe

Source:  The Bartender's Guide: How To Mix Drinks page:  80
1 wine-glass absinthe

Ingredient: absinthe

What it is:  Spirit
An anise-flavored spirit derived from herbs, including the flowers and leaves of the herb Artemisia absinthium (wormwood). Absinthe traditionally has a natural green color but can also be colorless. Although absinthe was vilified, no evidence has shown it to be any more dangerous than ordinary spirits.

(More about absinthe)
(Use small bar glass.)

Pour water, drop by drop, until the glass is full. Never use a spoon.