Follow the steps in order for the best result.
In a large skillet set over medium heat, brown the ground beef until it is fully cooked. Drain off any excess grease.
Introduce the chopped onion and green pepper to the skillet. Sauté the vegetables until they soften, becoming tender and slightly translucent.
In a separate bowl, thoroughly combine the tomato paste, water, vinegar, chili powder, brown sugar, cumin, oregano, salt, and pepper. Ensure all ingredients are well mixed.
Pour the prepared sauce mixture over the beef and vegetable mixture in the skillet. Stir well to ensure all ingredients are evenly coated and combined.
Allow the mixture to simmer, stirring occasionally, until it reaches your desired consistency. This process should take approximately 20 minutes, allowing the flavors to meld together beautifully.
Serve the Sloppy Joe mixture hot on your choice of toasted buns. Enjoy!