Underberg is a digestif bitter produced in Germany by Underberg AG, made of aromatic herbs from 43 countries. The exact number and identity of the herbs remain a well-guarded secret.The drink is usually associated with its famous portion-sized 20 ml bottle. The mini-bottle is protected by a straw paper sleeve and the embossed Underberg label is glued on. Underberg cannot be explained - it must be experienced.