Scallions are very much like Welsh Onions (aka Bunching Onions, aka Green Onions), except for a slight difference in the bulb. The sides of a scallion bulb will be straight, whereas the others above will have slightly curved sides. The green stems will also be slightly longer.
They also have a different scientific name, for anyone who still isn’t convinced.
Scallions have a milder taste than Spring Onions, but basically can be used interchangeably and handled the same as any green onion.
Storage Hints
Store refrigerated in a plastic bag for up to 5 days.
Language Notes
Some people even call any green onion a “scallion”. They tend to be the kind of people who will only cook in expensive copper pots.
These are the “green onions” that in Japanese cooking are called “Wakegi”.