Heat a large skillet over medium-high heat.
Add the ground beef, minced garlic, chopped green pepper, and onion.
Cook, breaking up the meat with a spoon, until the beef is browned and the vegetables have softened, about 8-10 minutes.
Drain off any excess grease.
Stir in the tomato paste until it coats the beef mixture.
Pour in the beef broth, then add the brown sugar substitute, Worcestershire sauce, and yellow mustard.
Stir everything together until well combined.
Bring the mixture to a boil, then reduce the heat to low.
Let it simmer for at least 20 minutes, stirring occasionally, allowing the sauce to thicken and the flavors to meld together.
Serve the sloppy joe mixture warm, garnished with fresh parsley. It's delicious on buns, over roasted spaghetti squash, or in lettuce wraps.
