1 med. onion, diced
1 stick celery, diced
1 lb. ground beef
1 c. ketchup
1 tbsp. cider vinegar
1 tbsp. prepared mustard
1 tsp. Worcestershire sauce
1 tbsp. brown sugar

Saute' onion and celery in 2 tablespoons oil, add ground beef. Brown and drain. Add remaining ingredients and simmer for 45 minutes, or bake for 45 minutes on low in crock pot for at least 3 hours.