is a digestif bitter
produced at Rheinberg
in Germany by Underberg AG, made from aromatic herbs from 43 countries, which undergo inspections and are based on a secret Underberg family recipe whose members are personally responsible for the production of the drink. Underberg is one of the most widespread kräuterlikörs
on the market… The drink matures in Slovenian oak barrels for several months to enhance the flavour.
Underberg is classified under "food and drinks: oils, herbs and spices" in the United States and can be sold without any sort of liquor license. -Wikipedia.com