Rum recipe: Hernán's Day Off

Invented by Zanne, executed by me, and named for the bastard who made the Aztec empire crumble, opened up North America to white people, and gave buccaneers a whole new coast to plunder.  But even Hernán Cortés needed a break and a cocktail.
--white rum
--sprig of chocolate mint
--smaller sprig of Moroccan mint
--Fee Brothers Aztec Chocolate Bitters
--ginger ale
--crushed ice
Muddle mint in crushed ice.  (Be sure to use both leaves and stem.)  Stir remaining ingredients.