The key to this drink is serving it ice cold and giving the flavours in the mint time to marry with the spirit. Hence, Juleps are ideally prepared hours...
Simple and excellent. I kept the mint for about 3 hours in Havana Club 3 Yo. and sieved it before shaking (as mentioned on the general Julep page). The resulting taste was wonderful. Next time I would cut back the syrup by half. Without any acids it is way too sweet.