It was created by Tom Schlesinger-Guidelli of Island Creek Oyster Bar in Boston.
(please note: I totally horked the image from the article so assume it should be credited to the article's author Jake Stavis)
Ready to make a Bitter Monk?
Step 1: Cocktail Ingredients for a Bitter Monk
1.5 oz. Old Monk Rum (or other dark rum)
.75 oz. fresh lemon juice
.75 oz. Aperol
1 dash Bittermens Tiki Bitters
Step 2: Preparation