Rinse the corned beef really well and place in a roasting pan or 9×13 aluminum tin
In a small mixing bowl or measuring cup, combine the rest of the ingredients
Mix well and pour over the corned beef
Cover the pan (If you are using a 9×13 you can use the tops they sell for these pans or heavy duty aluminum foil) and roast 2.5 hours. At this point check it to see if the meat is as tender as you like it. If not, return the meat to the oven for another half hour.
Slice when cooled (I sliced it when it was still hot, and served)