3⁄4 oz Fernet Branca
3⁄4 oz Lime juice
1⁄2 oz Simple syrup (1:1)
1⁄4 oz Orange liqueur, Prunier (Cointreau would work)
1 pn Salt
Shake and strain into chilled coupe, add the 3 drops of bitters on top.
Depending on your tolerance of sweetness the .5 oz of simple syrup could be a scant half-ounce and the drink still works.