In a Dutch oven or soup pot, brown the ground beef, onion and celery over medium-low heat until beef is cooked and vegetables are soft - about 7 minutes
Drain fat
Add mustard, sugar, Worcestershire, vinegar and ketchup and mix well
Pour in beef broth and bring mixture to a boil
Reduce heat and let simmer for 10 to 15 minutes, stirring occasionally
Recipe by eSoupRecipes at https://esouprecipes.com/sloppy-joe-soup