Most recipes only call for the green part of the green onion. No need to toss the white bulb part of the onion…simply place the bulb root side down into a glass of water, and set in a sunny window. The green onions will regrow! You’ll never have to buy green onions again 🙂
UPDATE: My mom regrows her green onions in a little flower pot with soil. This prevents you from having to change out the water occasionally and they grow much faster and much better in the soil! Moms know best!