We really enjoyed this but did give it a bit of a work over: Havana Club Original and Myers's Original Dark for the rums; no ginger syrup so instead 15ml Giffard Ginger of the Indies liqueur + 5ml triple sec + 5ml sugar syrup; the juice as specified; and 4 drops Bob's Daiquiri Bitters. Maybe a different cocktail...if so, bravo for the inspiration.