I got started late yesterday smoking a Brisket Flat on the Mini WSM and as a result it wasn't finished until midnight. I made a quick unloaded sandwich for sampling before going to bed. It will be good today with the Brisket Drippings (Au Jus) and with all the condiments.
My injection and mopping sauce: Put stick of butter into sauce pan, some Worcestershire Sauce, Garlic clove, Onion Powder, 1 cup low sodium Beef Broth, 1 cup Apple juice. I also added a TBS of Lemon Juice and about 1/8 tsp of Cinnamon (that combination really enhances the real flavor of the beef).
The Rub is basically Jeff's Rub. To that I added about 1/2 cup of ground Roasted Pecan.