Add onion and bell pepper to a non-stick fry pan, cooking for 5-7 mins on medium heat, add water or low sodium broth to keep from sticking.
Add ground beef or chicken and cook through. (note: For those using ground beef, after it is cooked, place the beef in a colander and rinse it under HOT water. This will remove any excess fat from the meat.)
Put meat back into the pan and mix in tomato paste, vinegar, stevia, and seasonings. Stir until all the paste is mixed in. If the mixture is too thick, add water or broth to thin the paste.