1 oz Smith & Cross rum
1 oz sweet vermouth
1 oz dry vermouth
Combine all ingredients, stir with ice for fifteen seconds, then strain into a mezcal-rinsed cocktail glass and garnish with a grapefruit twist.
The nose is surprisingly subdued, with just a bit of the rum's normally volcanic funk and the mezcal's smoke, and some dark fruit from the vermouth. The sip begins somewhat thinly with some white wine, but slowly builds into the rum's funky esters, then dark wine from the sweet vermouth and rubbery smoke from the mezcal, which then recedes with mild bitterness, rum esters and mezcal smoke.
This is a fantastic cocktail. While all of the ingredients are pretty burly, they do a great job of keeping each other in check. As a note, you really have to use Smith & Cross for this cocktail. No other rum is going to punch through in quite the same way. You can adjust the balance a bit depending on your choices of vermouths. I used Dolin Dry and Punt e Mes, which is a pretty hefty sweet vermouth. Something more subdued like Vya will let the rum shine. But no matter what you pick, this is going to be an enjoyable experience.