[Death & Co]
The Brooklyn cocktail was inspired by the already popular Manhattan and Bronx cocktails to further cover New York City's 5 boroughs. The original recipe calls for Amer Picon which the Amaro CioCiaro subs for here.
A drier, more bitter Manhattan with a touch of sweet from the Maraschino liqueur but it's one of the first times I've really had to search for it (Maraschino can be a bully). Not a drink to under-dilute and potentially would benefit from a touch more vermouth and Maraschino. Some recipes (and even potentially the original) sub in Italian (sweet) vermouth which complements the rye whiskey better.