https://creativecommons.org/publicdomain/zero/1.0/https://www.rawpixel.com/image/4024859
Rowan berries.
Most people believe, that Rowan Berries are poisonous. That is good for those, who know, that cooked Rowan Berries are not poisonous and that marmelade made of them is very delicious, because they can find lots of Rowan Berries that nobody wants to harvest (exept birds).
Rowan Berries have healing effects on the digestion, the liver and the lung. This is a secret, that is unknown even by the Rowan Berry marmelade fans. Original public domain image from Flickr
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