When I find brisket on sale at the local supermarket, I buy several and prepare them this way:
Trim most of the fat from each brisket, and cut the trimmed brisket into several 1 to 2lb pieces.
Add about 1/4 cup finely chopped fresh cilantro to 1 bottle of Italian dressing.
Divide the brisket and marinade among 2 or 3 bags and freeze.
When ready to cook:
Thaw the bag of marinaded brisket in the refrigerator.
Remove the brisket and heavily coat each side of the brisket pieces with white pepper and garlic powder.
Sear or heavily brown each side of the brisket pieces in a hot, hot skillet.
After browning, line the inside of a casserole dish with aluminum foil and place the brisket and remaining marinade from the bag inside.
Cover tightly and bake for about 1 1/2 to 2 hours at 350 degrees.
Great with garlic mashed potatoes, or sliced very thin and toasted on top of any bread. Makes a great aujus. Also great cooked on the grill with corn-on-the-cob, or baked potatoes.