No, I'm pretty sure it's not an onion- I'm not even sure if it's food. It's seems more like material to me but that's as far as I get! Maybe Magic and Phoenix have decided to line their nests in modern white and it's their new rug.
Nice mystery shot! Great abstract. I am thinking that it is a facial wipe - one of those cotton round ones. This item has texture to it that could associate with it. I have some and that is what it looks like to me - or they can also be used to clean nail polish off too.