green onion

US /ˌɡriːn ˈʌn.jən/
UK /ˌɡriːn ˈʌn.jən/
"green onion" picture
1.

a young onion, especially one that has a small white bulb and long green leaves and is eaten raw

:
Chop the green onions finely for the salad.
Garnish the soup with fresh, chopped green onions.