A very special, use appropriately whiskey. Neat, it's challenging. Burn + prunes and other ripe fruit. Some ice and all kinds of things blossom. Layers on layers. Because, one presumes, of it's barreling, you can spot almost everything here except maybe smoke. I made one Manhattan with it and it was a bad match (as likely my fault as anything). Walk the tightrope between neat and distracted and there is magic. So far, it works best as a second drink of the evening, one good cube.