Add all ingredients into a mixing glass and fill ¾ with ice.
Stir to thoroughly chill and strain into chilled cocktail glass.
Notes
This cocktail originally used Amer Picon, which is unavailable in the United States. I substituted Montenegro Amaro and Amaro di Toscana with results I like.
Recipe by Cooking 4 One at https://www.cooking-4-one.com/2018/02/16/brooklyn/