This cocktail harnesses the flavour of Strega in an after-dinner cocktail and as its creator says, the sugar rim "brings out the tartness in the drink."
Definitely related to a whiskey sour, but the Strega and Nonino bring more sweetness and a lot more flavor. I like this better than a baseline sour, but it still isn't something I'll likely order unless I am seeking something with Strega in it.