Butter, Lemon, Smoke

I get the smoke, obviously, but from whence the Butter and Lemon? Sounds interesting. Also sounds like the sort of thing I might prefer neat. If you like this, you might try the Bernet Frankenstein, a mixture of Islay Scotch, Punt e Mes, and Fernet Branca, served neat.

One question: is the garnish a lemon wedge, slice, or what. It's a bit hard to tell in the picture. It also looks like the coupe is rimmed with something, but it might just be the light hitting it oddly.

Used Sheep Dip Islay in place of Peat Monster. 5 star.