Preheat oven to 350
Trim the brisket (if you haven't already done so). Pat meat dry with a paper towel.
Make a dry rub by combining all of the dry ingredients in a small bowl, and season all sides of the brisket with the rub
Place brisket in a roasting pan uncovered, and roast for 1 hour at 350-degrees
Remove brisket from oven, add the beef stock so that there's about 1/2 inch of liquid in the pan. If you have a big pan, you may need more than 1 1/2 cups of beef stock or you can also add water.
Lower oven to 300, remove brisket from oven and tightly wrap pan with aluminum foil. Place back in oven for an additional 3-hours or until fork tender.
Slice meat thinly across the grain. If desired, use the drippings from the pan to make an au jus sauce. Pour sauce over meat or potatoes, if desired.