Chop it very fine and use it in salads, on bread, rolled in a slice of cheese, etc etc.
The white stem contains a lot of glucose and allyl sulfides.
You can use it against colds, headaches, chills to the stomach, indigestion, and insomnia.
It's antipyretic, expectorant, anti-bacterial, and anti-fungal.
Spring onion should grow in every windowsill, that's clear!