
German amaro is a sweetened bitter-herbal liqueur (Kräuterlikör), the German counterpart to the Italian amaro, traditionally drunk as a digestif.
Sweeter and softer than the Italian bitters, and the spice blend is the part that varies most between houses. Anything drier needs syrup added rather than the bitterness taken away.
Both belong to the bitter herbal family, but German Kräuterlikör is usually sweeter and leans harder on anise and licorice. Swap one in and the drink turns rounder and less bitter, so the syrup comes down. Swap one in and the drink turns rounder and more medicinal, and its sugar needs watching.
The category is graded by bitterness: süß is sweet, Halbbitter sits in the middle, Bitter is dry and bitter. The word on the label tells you how much sugar you are pouring.