The last time that I made up a big pot of black beans for black beans and rice, a few of the tomatoes that I had boughten had moldy spots on them, so I cut those out before slicing up the tomatoes and then adding them into the black beans that I was cooking.
Only, twice after that when I was eating, all of a sudden I had a sudden taste of mold in my mouth, and I was like, "Damn," since somehow some mold from one of the tomatoes must have somehow snuck into the pot.
And, I could deal with that, only I hoped that it wouldn't make the beans spoil quicker and ruin the whole pot.