First, how long has it been in your brine? If more than a few days, you should take it out and rinse it, lest it will be too salty. Prep it with the yellow mustard and crush black pepper & coriander seed rub and let it set overnight. I'd cook it low and slow to at least 190F, then let it rest in a cooler for several hours. Not all the way done for a brisket, but done enough to be easily sliced. (I find that fully done briskets (203F) have a tendency to crumble when sliced.) Then all you have to do to serve is steam the slices until hot.