Found in the book the Four Hour Chef, by Timothy Ferriss, the cocktail is credited to Ian Scalzo from the cocktail bar Bourbon & Branch in San Francisco
Made this cocktail tonight to use of the last dregs from a jar of Burlap & Barrel Paprikash Mustard. Used the 2 oz white rum to "rinse" the jar & omitted the paprika powder. Totally AMAZED by how delicious this turned out! Thanks for posting this cocktail recipe (found initially on The Humble Garnish blog post November 28, 2016 entitled "Exploring Nontraditional Cocktail Elements – Sage and Smoked Paprika").