1. Put the sugar, Bourbon, Worcestershire sauce and cinnamon in a big zip-lock bag. Seal and shake to mix. Add pork and shake again to coat meat. Let marinate in bag for 15-20 minutes.
2. Meanwhile, set grill to medium temperature and allow to preheat.
3. Grill pork for about 24 minutes total, turning once.
No one will convince me that this pork tenderloin could be as good without marinading it in Bourbon. If you don't keep Bourbon in the house, be sure you go out and buy a bottle. Even if you never drink it, you'll have it in the house for your next pork tenderloin on the grill!