Isn't this the weirdist????
It is a malformed lemon that appeared in a greengrocer shop - and given to my sister.
We initially wondered what it was, but I looked closely and saw that it had the texture of lemon skin, and we slightly scratched the end near where it would have been attached to the tree, and found the strong lemon scent.
Maybe will be told the story of it - but at the moment - I know nothing. Freaky really.