Shake all ingredients with ice and strain into a frozen coupe glass.
Optional garnish: an orange twist.
I had expected the flavor to be a bit more bitter, but for a first experiment I found it quite smooth, as did a few others who tried a taste.
I was in my favorite restaurant in Chino, CA and wanted "something bitter" using Fernet Branca. The bartender had no ideas, so I decided a riff on the Negroni would be interesting.