I think @biobook was on target with her assessment that it's umami.
It seems that different people have issues with different foods, but the list of foods that
@yuneeq posted upthread all seemed to be high in umami.
I happened to have umami on my mind at the time, because it relates to my current research program, developing a low-salt, no-meat cholent. My preliminary studies revealed that meat is high in umami, so my next step was to investigate ingredients that might similarly provide umami. Tomato, soy sauce, balsamic vinegar were high on the list.
Maybe
@yuneeq has advice for those with a similar symptom.