It only took two days but I finally found the Tate Britain ...
I took an orange!
There was an installation by Roelof Louw called Pyramid (Soul City).
It was a pyramid of 5800 oranges! and each visitor was invited to take an orange and eat it (outside of the gallery), but as mine came from basically the bottom layer of 5800 oranges, it wasn't so much able to be eaten as ... practically dissolving.
But I did still enjoy it. Little orangeface.