well I have been using many many many scallions (green onions) in my cooking lately, and not that they are really that expensive, but I read somewhere (and...I honestly don't remember where...) that if you put the ends of a scallion in water, that they will regenerate, over and over again!
so of course, I had to try...and wouldn't you know...
Day 6 (and I added two more!)
so it definitely works! if you find yourself using lots of scallions...this trick is worth a try!