The re-engineering of this recipe to make it taste unique enough from the Sidecar is ridiculous. I've been through five spec tweaks and none of them truly highlight the grapefruit, even after replacing the Ango with BT Grapefruit bitters (which I'm second+ guessing because it removes underlying complexity)... The recipe above is reluctantly my favorite, and the most distinctive, despite not resulting in a moreish swill... I'll keep chipping away...