I had an onion sprout on me once also. I bought a decent sized clay pot (they are cheap) from Target and planted it. Lots of shoots grew out and they got approximately 3 feet long. Little flowers also grew on the end of the shoots.
It was fun and kind of comical to plant it. It was always a conversation piece because people were amused that I planted an onion.
Risk more than others think is safe. Care more than others think is wise. Dream more than others think is practical. Expect more than others think is possible. – Cadet Maxim
"Twenty years from now you will be more disappointed by the things that you didn't do than by the ones you did do. So throw off the bowlines. Sail away from the safe harbor. Catch the trade winds in your sails. Explore. Dream. Discover." - Mark Twain