In a large skillet, on medium high heat, add oil and onions, celery, bell peppers, a pinch of salt and sauté for 3 minutes.
Add ground beef and the aromatics.
Mix the aromatics into the beef, then add the rest of the ingredients. Mix everything together and “stab” beef with spatula to break up meat into pieces.
Add beef broth and bring it to a boil.
Reduce heat to a low. Let it simmer for 30 minutes, stirring every 5 minutes so the beef doesn’t stick to the pan.
Stuff buns with sloppy joe mix and serve with shredded cabbage.