Forget the mint, ginger takes over in this julep and it is a wonderful thing.
It begins with an infusion of ginger into Bulleit Bourbon, which will take around a week, maybe two, depending on your taste. I've had ginger-whiskey infusions come out perfectly at 5 days and some that needed 10, though I would start checking it at 2 days. A lot of this will depend on how much ginger you use.
Once that wonderful concoction is finished, more ginger is muddled with brown sugar, the bourbon is added, then it is all topped off with sparkling soda. The result is a snappy cocktail that is a celebration of both a very fine bourbon and the sweetened spice that is only found in ginger.