Cut the half lime in half again. Add the lime, falernum, and bitters to a rocks glass. Muddle. Add the rum. (Aged Barbados rum such as Plantation 5 Year is recommended). Add ice and stir. Float the blackstrap rum on top. Serve with a straw.
Cut the half lime in half again. Add the lime, falernum, and bitters to a rocks glass. Muddle. Add the rum. (Aged Barbados rum such as Plantation 5 Year is recommended). Add ice and stir. Float the blackstrap rum on top. Serve with a straw.