1 lb. ground beef (I use ground round or sirloin)
14 oz. ketchup
1 c. onions, diced
1 c. celery, diced
1 tbsp. mustard
1 tbsp. brown sugar
hamburger buns

Brown the beef. Add onions and celery and simmer to soften veggies. Add remaining ingredients and simmer 15 to 20 minutes until flavors blend. Serve on buns.