Heat a large skillet or frying pan over medium heat. Add a little olive oil to coat the bottom.
Add the finely chopped onions and green bell pepper to the skillet. Sauté for about 3-4 minutes until they start to soften.
Add the minced garlic to the skillet and sauté for another 1-2 minutes until fragrant.
Push the vegetables to one side of the skillet and add the ground beef to the other side. Cook the beef, breaking it up with a spatula as it browns. Cook until it's no longer pink, usually around 5-7 minutes.
Once the beef is cooked, mix it with the sautéed vegetables in the skillet.
Stir in the crushed tomatoes, tomato paste, brown sugar, Worcestershire sauce, chili powder, paprika, salt, and pepper. Mix well to combine all the ingredients.
Reduce the heat to low and let the mixture simmer for about 15-20 minutes, stirring occasionally. This will allow the flavors to meld together and the mixture to thicken.
While the sloppy joe filling is simmering, you can prepare your burger buns or rolls by toasting them lightly if desired.
Once the filling has thickened to your liking, taste and adjust the seasoning if needed. Add more salt, pepper, or chili powder to suit your taste.
To serve, spoon the sloppy joe mixture onto the bottom halves of the burger buns or rolls. Top with the other half of the buns.
Serve hot, and you can also add cheese slices, coleslaw, or pickles as toppings if desired.Enjoy your homemade sloppy joes with metric measurements!