Botanical fruit, gastronomic vegetable. Simple enough; stranger things certainly exist in this world. Besides, according to Wikipedia tomatoes aren't the only botanical fruit to be widely considered a vegetable: the same goes for cucumbers, avocadoes and pumpkins, among others.
Have you ever been on a diet? If so, what's the most amount of weight that you've lost?
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It is easy to go down into Hell;
Night and day, the gates of dark Death stand wide;
But to climb back again, to retrace one's steps to the upper air –
There's the rub, the task.
– Virgil, The Aeneid (Book VI)