Shake, strain into a coupe rinsed with the flamed rosemary sprig, then douse it in the liquid and use as garnish.
Named for a pirate in Robert Louis Stevenson's Treasure Island. As originally written the recipe called for 3/8 oz each of honey syrup (1:1) and ginger syrup.
Winner of the February 2014 ShakeStir NY Flash competition. The challenge was to create a sour featuring no more than six ingredients and no fewer than two of five sponsoring spirits.