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xkcd #2827: Brassica
(imgs.xkcd.com)
Alt text:
Sequoia Brussels sprouts are delicious but it's pretty hard to finish one.
Blackberries have grown wild in Europe for thousands of years. The US ones have been messed with by farmers and scientists, but in the UK they're pretty much the original deal.
Or wild (smaller) strawberries.
Same with lots of berries, like billberries, currants and raspberry.