1 oz Bourbon, Buffalo Trace
1 oz Zwack Unicum
3⁄4 oz Sweet vermouth, Carpano Antica Formula
1⁄2 oz Lime juice (Fat)
2 ds Orange bitters, Angostura
1 twst Grapefruit peel (expressed, discarded)
Instructions
Shake, strain, express peel and discard
Glasswared recommendation? Seems like the kind of drink that could languish on a big cube for a while.