Yet another great idea from Pinterest.
Given my floral background and knowledge of plants I'm ashamed I didn't think of this one on my own but thanks to Homemade Serenity I can share this idea with you.
When you buy green onions use what you need and then put the bulbs into water and watch them grow! I changed the water every few days to keep it fresh and left them in a sunny window.
I'm sure at some point the bulbs runs out of energy but in about 10 days I had enough to use. Genius!