(or Akvavit) is a Scandanavian spirit that is made from various spices and herbs. Traditionally caraway is the predominate flavor, but it doesn't have to be.

The following recipes on this site use aquavit:

Norwegian Wood
aquavit, applejack, sweet vermouth, Chartreuse,
Smoke and Mirrors
aquavit, Campari, Cynar,
sherry, Cynar, aquavit, peach bitters,