Combine butter, brown sugar, corn syrup, water and whiskey in a large saucepan over medium heat.  (Syrup will bubble up so make sure your pan is extra large).  Stir constantly until butter is melted.  Continue stirring until mixture comes to a boil; boil and stir for 1 minute. 

Remove from heat and stir in cinnamon, vanilla and pecans. 

Serve immediately or refrigerate until ready to serve.  Syrup can be stored for 2 weeks in refrigerator. 

Recipe Note:  Vary amount of cinnamon to your taste.

Fireball® is a registered trademark of Sazerac Company and is not affiliated with ACH Food Companies, Inc.