B.D.
I have a fail-proof recipe. Remember when you're buying your brisket that it will shrink by about 40% when cooking. Give yourself plenty of time to do this slowly (there's no rushing brisket).
BEEF BRISKET
Place beef brisket in large dish to be used for marinating.
Sprinkle liberally on each side with worcestershire sauce, soy sauce, salt, pepper, garlic powder, celery salt (optional). Marinate overnight (or at LEAST 12 hours)
Place in large baking dish, fat side DOWN. Slice one large onion and place over top of meat. Cover pan securely with foil.
Bake for five hours at 300 degrees (F) remove from oven, uncover and wait 1/2 hour before slicing AGAINST the grain of the meat. Serve with the juice from the pan or use barbeque sauce. Makes wonderful sandwiches or lovely slices of meat to serve a crowd.