It happens both when stored in pyrex or tupperware.
Ingredients aren’t anything unusual; onions, garlic, hamburger, tomato paste, etc.
Tastes sweeter when fresh off of the stove, but has a more bitter taste when reheated as leftovers.
If you put hot food in tupperware with a lid on, bacteria can form on the inside of the lid. It’s harmless but can make the food bitter. Cool it before you cover it
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