2 1/2 lbs. lean chuck roast
1 lg. onion, chopped
1/2 c. chopped celery
2 tbsp. vinegar
4 tbsp. lemon juice
3 tbsp. Worcestershire sauce
1 c. ketchup

Combine all ingredients in crock pot. Cook on medium for at least 1 1/2 hours. Use two forks to break apart beef and to remove any strips of fat.