Peychaud's Bitters
From The Webtender Wiki
Peychaud's Bitters is a red, gentian-based bitters with a lighter, slightly sweeter taste compared to Angostura Bitters. It was created around 1830 by Antoine Amédée Peychaud, a Creole apothecary from Haiti who settled in New Orleans, Louisiana. It's a necessary ingredient of the Sazerac.