After opening the can of tomato sauce, if you cannot eat it all at once, it will easily go bad after being stored for a period of time. If you open the can of tomato paste and steam it in a pot before eating, the leftover tomato paste will not deteriorate for a longer period of time. Another good way to prevent tomato sauce from going bad is to put a layer of plastic wrap around the opening of the can of tomato sauce to seal it, and store it in the refrigerator for a long time. When eating, just scrape off the top layer and eat.
