Also known as "scallions" or "bunching onions," green onions have a mild onion flavor and are delicious raw or cooked. Store green onions in the fridge for a week or more. When cooking with green onions, the entire plant is delicious. Use the green part in place of chives. Cook them whole: cut off the roots, toss with olive oil or butter and salt, and grill, saute or roast on high heat until tender and beginning to brown.