From the middle of March, I was asked to keep the skin of onions for Easter. And this is what they are for!
Just by boiling eggs with onion skins, they became beautiful reddish brown. I tried it as well with two of my eggs and off course with some piece of paper! The paper became yellow and my fingers brown.
There is a Japanese story by Naoko Awa called Kitsune no Mado or Fox Window.
The fox dyes people's fingers with balloonflower. If you make a rhombic window with your thumbs and index fingers colored by him, you can see whatever you want through it. I wonder what we can see through the window colored with onion.