This classic cocktail, served at the Polo Club Lounge in New Orleans, was thought to have been developed in New Orleans by the native New Orleanian, Antoine Peychaud. The locally-made Peychaud’s Bitters are named after him.
Combine whiskey, simple syrup, and bitters in a mixing glass with ice. Stir until mixture is homogenous. Coat the inside of a rocks glass with Herbsaint (discard any extra). Strain contents of mixing glass into glass and allow 3 ice cubes to fall into drink. To garnish, rub a lemon twist on the rim of the glass then drop it into the drink.