Peychaud's Aromatic Cocktail Bitters
Probably second best known bitter in the US and somewhat known outside of it. Required ingredient for the Sazerac Cocktail. Also used in place of angostura bitters in many popular cocktails by some. Originally made by Antoine Amedie Peychaud, an apothecary in New Orleans. Peychauds Bitters blend the other ingredients together, add many layers and depths of flavor, and may even help your digestion afterward.
A must have item for a bar for either a Sazerac or other drinks that call for Peychauds or as a specified bitter by a customer- otherwise people will wonder what happened to their drink as this bitter has a very distinctive taste. Goes well with cognac or rye-based drinks in particular.