• Green onions are young shoots of bulb onions, and are milder tasting than large bulb onions
• They have a small, not fully developed white bulb end with long green stalks
• When buying green onions, look for ones with bright green tops, firm stalks (not wilted), and a firm white bulb at the bottom

How do I prepare it?

• Wash thoroughly in cool water, remove the bulb at the bottom, and chop the green stalks into fine pieces (as in above photo)

Where can I buy this?

• You can buy from any supermarket

What is the cost?

• Green onions are very affordable
• When shopping in chinese grocery stores, it is possible to get green onions free (with a purchase of other vegetables)

Any benefits?

• Green onions are fat-, sodium-, and cholesterol-free, low in calories, and high in vitamin C.
• They also contain dietary fiber, vitamin C, vitamin B6, potassium, and other key nutrients
• They make a great garnish

Any precautions?

• None that I can think of.  Enjoy!

Resources:

• http://www.recipezaar.com/library/getentry.zsp?id=363
• http://en.wikipedia.org/wiki/Scallion
• http://www.tonytantillo.com/vegetables/greenonions.html
• http://www.thefresh1.com/green_onions.asp