Mix together Ketchup/Chili Sauce, Onion Soup Mix and water.
Place Brisket and sauce mix in Ziploc Freezer Bag and refrigerate overnight.
Add contents of Ziploc Baggie to Pressure Cooker cooking pot.
Lock on Lid and close Pressure Valve.
Cook at High Pressure for 60 minutes.
When Beep sounds, allow a full Natural Pressure Release.
Remove Brisket from Pressure Cooker, making sure the Pressure Cooker is in "Keep Warm" mode.
Slice the Brisket on the opposite side of the grain.
Carefully return the Slices of Brisket to the sauce in the Pressure Cooker to keep warm until it is time to serve.
Notes
If serving right away, place the Brisket slices on a serving tray. If you want a thicker sauce, allow it to simmer while you slice the Brisket. Watch it though, the sauce will get super duper thick, really fast. Pour the sauce over the Brisket and serve.If you are in a big hurry and need dinner on the table really fast, cut the brisket into 4 inch chunks and place into pressure cooker. Cook for 15 minutes instead of the full cook time. Allow the pressure to release naturally.