Heat oven to 350 degrees Fahrenheit. Cut up the veggies.
Place the brisket and vegetables in a roasting pan. Mix the onion soup packets with water and pour in until the brisket and vegetables are covered with liquid, adding more water as necessary. Cover and place in oven.
Cook covered for 2-3 hours until tender. I try to check on it and make sure the meat stays tender. Once it's done, let it sit for 1 hour to rest. Serve.
Notes
Some recipes use a tomato product such as ketchup or tomato paste, but my father's does not.Substitutions:If you don't like yellow potatoes, you can use any kind you prefer. I used a Kosher cut of brisket because I was near a Kosher supermarket and I knew they would have it in stock. It was more expensive at my local supermarket, $55, but only $43 at the Kosher supermarket. If you can snag one on sale and freeze it, that is the best way.