When you are in downtown Louisville, Sidebar is a must-stop for any bourbon lover! Thank you again for sending over your recipes!  Here is their recipe for a 3-Liter Barrel-Aged Diamond Back.  Frankly, I have never heard of this concoction, but it sounds amazing!

45 oz Dickle Rye Whiskey
22.5 oz Lairds Apple Brandy
15oz Yellow Chartreuse
7.5oz Aperol

Age 2-3 weeks in the barrel, then empty the barrel into a decanter. Stir with ice until diluted slightly.

Credit to Cafe Milano for the picture.