Six Ways to Turn Your Kitchen Scraps Into Houseplants
This image is pretty self explanatory - regrow scallions in water. When I visited Homemade Serenity, the site where the pin was taken from, it was part of a post called "Wordless Wednesday". So, there were no instructions for this, but after a little searching I discovered that someone from The Kitchn tried it and it works! Simply place scallion scraps in water and watch them grow.
Place the cut end of an onion in a pot, water well and you should never again find yourself without onions! This is so much better than making last minute runs to the grocery store. Visit Tipnut to learn more about this and other "Nifty Food & Plants to Grow Indoors."