Frankly, a sauce made entirely out of condiments is embarrassing enough (even if it tastes great!), but the whole process was compounded by two facts: I was doing this on a build day at Instructables, so couldn't get away without documenting it, and because it's entirely made of condiments for use on leftovers, others in the test kitchen dubbed it "bachelor sauce." Here's the recipe:
Nutella Barbecue Sauce or Bachelor BBQ:
2 parts mustard
1 part Nutella
1 part Sriracha hot sauce
1 part sherry vinegar
mix everything together. Adjust the sriracha down if you prefer less heat. Smother on pork shoulder cooked en sous vide for 24 hours and enjoy!