Absinthe is a strong herbal liqueur distilled with a great number of flavorful herbs like anise, licorice, hyssop, veronica, fennel, lemon balm, angelica and wormwood (The flavor of anise and/or licorice, at least in contemporary forms of the liquor, tends to predominate). Much of the liquor's legendary effect is due to its extremely high alcohol content, ranging from 50% to 75% (Usually around 60%), plus the contribution of the various herbs. It has been assumed by many that the so-called "Active ingredient" in absinthe is wormwood, although that is apparently not really the case now. What we call absinthe today is a toned down version and that is allowed everywhere and anywhere.
You can find some really good absinthe cocktail recipes at :