Spring onions are onions picked while young. They taste just like onions, but milder. It's high in vitamins a, c and k, iron, calcium, manganese and loads of other things your body needs. It's also able to cure a cold (No, seriously. It's called Chao tieu hanh.)
How to select and store spring onions
They should have a glossy appearance, and the tops should be bright green and firm. Anything from a tiny, hardly visible bulb to a large one is acceptable. They should be kept in the fridge, not out in the open, and will last about a week. But if you keep them in a tightly sealed plastic bag they can last almost a month.
How to prepare spring onions
They're easy as pie to prepare. to slice, just cut off the root. (Off, not through. Spring onions can still kill your eyes.) and discard. You could add it to your stock bag if you want, but it's so small there's really no point. (Though if you had a lot of them...) and slice into "circles" You can cut up the whole thing for most recipes, though some ask for only the green and some ask for only the white. This is usually a texture or colour decision rather than flavour.
To chop, Stack slices and slice the other way. as small as you want. (Though a medium slice is usually just perfect.)
Recipes:
Nachos