It is perhaps best described as a Trinidadian Daiquiri due to its heavy use of Angostura Bitters. According to Owen Rutter, it was also originally made...
Super good! Grenadine aplenty comfortably nestled in amongst the sweet vermouth and the Angostura and tempered by the sour lime plus sufficient rum. I used Bacardi Gold. Curious to try it with a dash or two of Rum Fire.