Fanciulli is an not so well known variation that stems from the typical Manhattan cocktail recipe. Traditionally, a Manhattan has Angostura bitters which provides some aromatic anise, cinnamon, and herbal flavors to compliment the rye and sweet vermouth. However, the addition of Fernet Branca, a strong bitter liquor adds a totally different, almost methanol kind of flavor. For me the sweet vermouth in this Fanciulli recipe was a bit overwhelming ratio rise so I would almost make it just shy of 3/4 of an ounce and increase the fernet a spoon full or 2. Also using an overproof rye will help offset the strength of fernet, as it tends to overtake almost any cocktail (especially mixed with more delicately flavored liquors like gin). Depending on your taste for Manhattan, this can be a fun cocktail to play around with different ratios of rye (or bourbon) to sweet vermouth to fernet!
Stir all 3 ingredients over ice until the outside of the cocktail glass is very cold to the touch and then strain into a martini glass. Garnish with maraschino cherry.