Instructions
Shake (yep, shake), strain over cracked ice in a rocks glass.
Notes
Fernet Branca marketing lore has it that Maria Callas took her Fernet with peppermint syrup, a fact that led, they say, to the creation of the product that eventually became Branca Menta. Here's a nightcap in her honor, with some similarities to a drink named for another opera great, the Caruso.
History
Originally made with 3/4 sweet vermouth rather than honey ginger syrup, until I tried the syrup and decided I liked it better.