Bourbon and maple syrup somewhat overwhelm the headline port wine, although it does add an underlying fruitiness to this balanced and tasty riff on an...
I've been making something similar to this for many years. The bar I learned it from considered it a riff on a Manhattan and thus named it the "Port Authority, " which is too perfect a name not to share.
This was a great cocktail. The port basically was there to round out the bite of the bourbon…basically a smooth old fashion (I used a bonded bourbon).