I think because of it's layered qualities, the onion is the perfect metaphor food. You can compare it to life, years, seasons, etc. This onion has been growing in my fridge door for a while. Seeing its green sprouts reminded me to go to the grocery store every time I opened the door for iced tea. I kept ignoring the sprouts. Eventually, a whole new onion had grown in the fridge door and I didn't have to go to the grocery store. Just kidding.