Sloppy Joes – Grandma Dennis

• 1 lb ground beef
• 2 Tablespoons ketchup
• 1/2 cup chopped onion
• 1 Tablespoon prepared mustard
• 1 can Chicken Gumbo Soup

Cook hamburger and chopped onion until done. Add remaining ingredients and simmer 10 minutes. Stir occasionally. Spoon over toasted buns and serve.