Slice 2 onions and place in a roaster on the stovetop.

Sprinkle onions with salt, pepper, garlic, and flour.

Add 1/2 cup water.

Cover the roaster.

Cook on low heat for 30 minutes.

Add the brisket to the roaster.

Turn the brisket a few times.

Add another 1/2 cup water and the can of tomato sauce.

Turn the brisket a few times and cook for 2 hours.

Remove the brisket from the roaster and let it cool.

Slice the potatoes and place them into the pot/roaster.

Slice the cooled brisket.

Place the sliced brisket on top of the potatoes.

Cook for an additional 45 minutes.

Add water if necessary to prevent burning.