Did you know that many vegetable scraps, including green onions, can be placed in water to re-grow? When chopping green onions for a recipe, simply trim the root end with a few inches of white away from the green part of the stalk. Place the root ends upright in a jar, covering the roots with a few inches of water, and set in a sunny window.
In the photo above, the onions on the left have been shooting upward for exactly 1 week. The onions on the right have been growing for 4 weeks and are ready (or past ready) to use. You can snip the onions at any time as needed, or you can wait until they are taller, cut them off near the roots, and begin the process again. This gives you a continuous supply of scallions! You may need to refresh the water in the jar after several days.
I'm glad we tried this experiment. It's nice to have a little bit of something growing while there is still snow on the ground outside. Have you done something similar with success?