Preheat oven to 300 degrees
Get out and measure your ingredients.
In a bowl, mix together the tomato soup, onion soup mix, water, brown sugar, and vinegar.
Stir until blended.
Lightly salt and pepper both sides of the brisket, then place it fat cap side up, into a baking dish that has sides (a 9x13 or a roasting pan would work well.)
Pour the soup mixture over the top of the brisket.
Cover the baking dish with aluminum foil
Bake the brisket at 300 for about 2 ½ hours. After about 1 ½ hours, carefully remove the tin foil and let the brisket cook for the remaining time without the cover.
Brisket is done when it has reached 200 degrees and is tender.
Let sit for 5-10 minutes before slicing.
Reserve the liquid the brisket cooked in, skim the top to remove excessive oil, then serve the liquid as a sauce for the brisket.
Enjoy.
Every bite.