Preheat oven to 250 degrees
Place well trimmed brisket into oven bag. Mix BV with hot water, pour over brisket. Sprinkle onion soup mix on top. Close bag with tie. Place on cookie sheet that has an edge. Place in middle of the oven.
Bake for 5 to 6 hours.
Cool in bag.
Mitzi started making this when she was first married, but the first recipe she had a recipe that was too rich. She swapped the rich sauce for something a little more mild so the whole family could enjoy it.