Overnight Pot Roast

Directions

1. 1
   Place onion in the bottom of a 5-quart slow cooker.
2. 2
   Coat flank steak with Montreal seasoning; place on top of onion.
3. 3
   Sprinkle soup mix over roast and add undrained tomatoes.
4. 4
   Cover and cook on low heat setting for 8 hours (overnight).
5. 5
   In the morning, stir together the celery and celery soup.
6. 6
   Spoon into slow cooker.
7. 7
   Cover and continue cooking for 8 hours more.
8. 8
   Serve roast hot with gravy.