If you can't eat it all at once, it will go bad after a period of time. So how can we keep the tomato sauce opened for a longer time? Let me give you a few ideas.

Method one: pretreatment before eating, open the ketchup, steam it in the pot first, and take the sauce with a non greasy spoon. In this way, the leftover ketchup can be kept for a long time.

Method 2: put a layer of fresh-keeping film at the opening of tomato paste can and seal it well. It can also be stored in the refrigerator for a long time. Scrape off the top layer when eating.

Method 3: Salt + sesame oil. After eating each time, sprinkle some salt and sesame oil into the pot, which can effectively inhibit the reproduction of bacteria in tomato sauce and prolong the storage time.