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. Choose green onions with crisp, bright green tops and a firm white base. You can eat both the green tops as well as the white bulb. They are excellent raw in salads, and delicious prepared in soups, stir-fries, sautees and casseroles.