scallion

US /ˈskæl.i.ən/
UK /ˈskæl.i.ən/
"scallion" picture
1.

a long-necked onion with small bulbs, eaten raw, especially in salads; a spring onion

:
Chop the scallions finely for the garnish.
Add sliced scallions to your stir-fry for extra flavor.