I don't know why the other reviewer mentions Cloosterbitter and goes on to describe that product in his review, as it has nothing to do with this product other than the maker. That is a completely different herbal liqueur while Beerenburger is an herbal bitter. Beerenburger is light brown/honey colored (from caramel) and is dry with no sweetness. It is made from a maceration of gin with 11 or more botanicals (bottle says 11, website says 14) including juniper, coriander seed, laurel berries, licorice root, and blessed thistle. Website includes gentian in the description.
Some comments at various sites have suggested it is similar to Jagermeister, but it bears only the slightest resemblance. Jagermeister is much more intense, while this Beerenburger is mild. It is so subtle and dry that there is not much to work with, although it is not unpleasant.