Biologists have a very simple rule, and it’s surprisingly grown-up. A fruit is the mature ovary of a flowering plant, and it contains the seeds. So, if it started as a flower’s baby-making body part, it’s a fruit, period.
This means cucumbers, peppers, and squash are all fruits. They are the sneakiest of the bunch, pretending to be boring vegetables while living a secret life of botanical romance. Even a bell pepper has the audacity to be a fruit, which feels like a betrayal to anyone who has ever stuffed one with cheese.
A vegetable, on the other hand, is basically anything else from the plant. Roots, stems, leaves—if it’s not the seed-holding part, it gets lumped into the vegetable bucket. Carrots are roots, lettuce is leaves, celery is a stalk of regret. They have no ovaries to brag about.
