Oh that one goes around every so often. Usually it's with tomatoes - but sometimes with the other plants that are botanically fruits but less sweet than traditional "dessert" fruits (all the cucurbits - whether sweet melons or less sweet squash, and all the edible nightshades except potatoes - including both the sweet ground cherries and the less sweet tomatoes, peppers and tomatillos).
AFAIK what we think of as vegetables, are nutritionally vegetables. Anyone with some detailed knowledge of plant enzymes want to expand on that?
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