1 1/2 lbs lean ground beef
1 Yellow Onion, Coursely Chopped
1 Tbsp Ketchup
2 Tbsp Prepared Mustard
1 can Campbells Chicken Gumbo Soup
1 tsp Salt
1/2 tsp Ground Black Pepper
Place ground beef and onion in a heavy frying pan (12"-14"), and cook uncovered over medium heat,
breaking up ground beef with a spoon as you cook, until completely cooked with no pink remaining.
Spoon off any excess oil and discard. Add soup, ketchup, mustard, salt and pepper to beef and onions,
and bring mixture to a boil. Reduce heat to low, cover and simmer for 30-45 minutes, stirring occasionally.
Serve on Hamburger buns.