NOTE: Please see the recipe for Corned Beef and Cabbage for complete instructions. This video leaves out these instructions from the recipe: "Rinse brisket; discard brine. Place in a large pot. Add enough water to cover by 2 inches. Add onion, celery, and carrot, and bring to a boil. Reduce heat, cover, and simmer until very tender, 3 to 3-1/2 hours." It is important to discard the brine solution and add new water to the pot before you boil the beef. Do not boil the corned beef in the brine.
Then, for leftovers, see How to Make Corned Beef Hash!