Sazerac
The Sazerac is a local variation of a cognac or whiskey cocktail originally from New Orleans, named for the Sazerac de Forge et Fils brand of cognac brandy that served as its original main ingredient. The drink is most traditionally a combination of cognac or rye whiskey, absinthe, Peychaud's Bitters, and sugar, although bourbon whiskey is sometimes substituted for the rye and Herbsaint is sometimes substituted for the absinthe. Some claim it is the oldest known American cocktail, with origins in antebellum New Orleans, although drink historian David Wondrich is among those who dispute this, and American instances of published usage of the word cocktail to describe a mixture of spirits, bitters, and sugar can be traced to the dawn of the 19th century. The defining feature of the Sazerac is its method of preparation, which commonly involves two chilled old-fashioned glasses. The first glass is swirled with a wash of absinthe for its flavor and strong scent. The second glass is used to combine the remaining ingredients, which are stirred with ice, then strained into the first glass. Various anisettes such as pastis, Pernod, or Herbsaint are common substitutes when absinthe is unavailable. In New Orleans, Herbsaint is most commonly used due to the absence of absinthe in the U.S. market from 1912 until 2007.
Source: Wikipedia