You know what's great with Amaro? Amaro. This cocktail started off as a Black Manhattan riff, subbing Amaro Nardini for the usual Amaro Averna, but then it struck me that those Amari play nicely together.
From there, adding espresso syrup to highlight the coffee notes of Averna, along with orange and chocolate bitters to highlight those same note in Nardini, was a no-brainer. Hand-cut ice is a good call, as this is a tight drink, which should stay cold, but undiluted.