This recipe was found in Sally Ann Berk’s The Martini Book. I’m not sure the precise origins, but this is actually a rather surprising little drink. The Campari takes the medicinal edge off of the Cherry Heering/ Brandy/Kirschwasser.
Bu first, there’s actually a substantial difference between the Cherry spirits used across the three drinks.
Kirschwasser: clear and colorless German brandy made from a kind of sour cherry. The cherries are fermented with their pits. The result is a cherry flavored, but not sweet brandy. Often called “Kirsch” for short.
Cherry Heering: dark red cherry liqueur, not overly sweet, but slightly medicinal. Considered by some to be the “best” of the dark cherry liqueurs.