Sour Cream Pot Roast

1 beef rump roast 4+ lbs.

1 chopped onion

1 cup sour cream

8 lg. carrots - diced

2 cups celery - diced

2 or more tomatoes - diced

Salt & pepper

Brown all sides of roast. Add onion. Pour sour cream over and simmer slowly till tender – 3-4 hours. Add vegetables the last 15 min. Serve over mashed potatoes.