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.
Note:
or is it a bitter? sub: Herbsaint, Pernod, pastis
Further reading:
http://en.wikipedia.org/wiki/Absinthe