If salt can be the best profile enhancer for food, then most certainly the same theory can be applied to cocktails. Add a dash of this to any cocktail to bring out the flavour profile and expand your palate.
— stir, serve up, rosemary sprig garnish —
1 oz. dark rum
1/2 oz. Cointreau
1 oz. cold brew coffee
12 drops Bar 40 Salt Bitters