Herbsaint is a brand name of a liqueur that is used as a substitute for absinthe in cocktails. This anise-flavored spirit can be hard to find in some areas, and it can also be quite expensive. Luckily, there are several alternatives to Herbsaint that can be used as a substitute. Pastis, an anise-flavored spirit from France, is a popular option. Sambuca, Ouzo, and Pernod are also excellent choices if Herbsaint isn't available. Additionally, some people use anise extract or fennel seeds to mimic the flavor of Herbsaint in their cocktails. Whatever substitute you choose, be sure to use it in moderation, as these types of liqueurs can be quite strong!