I was shown this method many years ago and it comes out pretty damm good, my wife and daughter love it as do guests that eat it. It is fairly easy as well, save for the brining.
-Trim some of the excess fat away, but not any near the flat part.
-Then Brine a brisket in icy cold water with salt and sugar, I also use bay leaves, cut up onions, parsely if you got it, fresh ground pepper.
-I brine it in a large pot and put it in a cooler with ice around it overnight.
-Take out of the brine, pat dry.
-In a roasting pan make a tent with aluminum foil, place the brisket in the pan fat side down.
-Pour about half a bottle of soy sauce on it, put some of the crushed garlic from a jar on it, a little pepper and maybe some Jane's seasoning.
-Place in oven about 225 after tenting and sealing foil.
-At about 6 hours of cooking, take it out and open the tent, and put the contents of two drained cans of Lima Beans on top of it.
-Re-tent and place back in the over for 3-4 more hours. This is with about a 12-15 pound brisket.
It comes out tasting really good and if make some mashed potatoes you have a somewhat green veggie with it ready to go. I have had better briskets than this, but not outrageously better. The gravy/sauce it makes goes great with the mashed potatoes.