Drink Away Your Sadness With a 'Bitter Tears'

My favorite nightcap is an ounce or so of Fernet, over ice, with a pinch of salt, but that drink signals the end of a good evening, not the start (or even the middle) of one. But I want to be salty all night long--from beginning to the bitter end--so I decided to take that flavor profile and make it into a martini.