1. Combine lemon juice, lime juice, bourbon and ginger syrup in a pitcher. If not serving right away, cover and let sit in fridge until ready.
2. To serve, shake with tons of ice and add a cherry (if you want!)

To make ginger syrup:

1. Combine ginger, sugar and water in a small pan.
2. Bring to a boil, and then reduce heat and simmer for 15 minutes.
3. Let cool and then strain out ginger.
4. Extra syrup will stay in the fridge for two weeks!