Season a chilled mixing glass with the Frangelico. Stir the remaining ingredients in the glass and strain into a martini glass. Garnish with the lemon twist.
Created by Marie Maher, former head bartender of the Greatest Bar on Earth in the Windows of the World complex, which occupied the 106th and 107th floors of Tower One of the World Trade Center in New York City, destroyed in the terrorist attacks of September 11, 2001. Maher was no longer on staff when the tragedy occurred.