Absinthe has never been so refreshing as here in this Absinthe Frappe, a crisp, cool highball that traces its roots at least back to the late 1800s. Frappe in this context means vigorously shaken, rather than blended (although you can blend it, if that’s your preference).
Absinthe and other anise liqueurs vary greatly in sweetness; we like to start with the amount of simple syrup listed here and increase as needed.