First you mix the sauce in the pot:
1 cup packed brown sugar, 1/4 cup flour, 1/2 cup beef broth, 1/4 cup white vinegar, then add ketchup, soy sauce, garlic powder, onion flakes, and mustard.
Stir together and heat until thickened. I added a little water to deglaze the pot.
Then added the wings. I used drummettes because I like them better, but you can use whole wings.
Slow roasted covered, for 5 or 6 hours.
They were falling off the bone and tasty!