What Are Spring Onions, then?
Spring onions, on the other hand, look similar to scallions, but you’ll notice that they have small onion bulbs at the base. These onions come from the varietals that produce bulbs and are basically more mature versions of scallions. They are planted as seedlings in the late fall and then harvested the next spring, thus the word “spring” in the name.
Spring onions are sweeter and mellower than regular onions, but the greens are more intense in flavor than scallions. The bulbs can be red or white, depending on the varietal, and while they can be used in much the same way as regular bulb onions, they are great grilled, roasted whole, or used like pearl onions.