How to grow garlic indoors_AJO_ using a garlic clove that had sprouted in with the onions. So much easier that I thought it would be. Grew so fast I had to transplant it to a bigger pot after just a couple of weeks. So much fun.
This article titled "How To Grow Sprouted Onions" at Alternative Gardening talks about exactly that. I had no idea. All this time, if I didn't eat an onion in time, I would simply plant the whole thing as-is in the soil.