I made pizza today. The last time I did this I had some leftover tomato sauce; when I opened that it went POP and smoke came out of the jar. Tasted really bad, too, so I threw it away and opened a new jar.

I keep having to do this. I close the jar tight and put it directly in the refrigerator, but it still goes bad.

What can I do to prevent this? Is there some sort of preservative I could add to the remaining sauce to keep it from spoiling?

  • 1
    Small point - the 'smoke' is just water vapor condensation. Commented May 24, 2018 at 13:56
  • 1
    How long was it in the fridge? The fridge slows spoilage down, but it's not forever.
    – Joe
    Commented May 24, 2018 at 18:00

1 Answer 1


Put leftover sauce in a zip-style freezer bag. Seal most of the way. Lay on counter and gently remove air, sealing the rest of the way at the last moment. Freeze flat. Freezing will extend the shelf life. Freezing flat will allow for easier storage, and faster thawing.

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