I just had some of my mom’s leftover spaghetti, and I realized that it always has a slightly more bitter taste in the morning after being reheated. What causes this kind of reaction?

Question

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.

In: 159

Answer 1

My mom would make a large pot of spaghetti sauce so we always had leftovers. I liked the leftovers better than the fresh spaghetti. She told me that she added a secret ingredient to the leftovers but wouldn’t tell me what it was. I asked years later and she told me the secret ingredient was ketchup.
She added ketchup to leftover spaghetti and I loved it. I sort of felt like a redneck.