Cipollini onions (also known as Cipolline Onions) are flat-shaped interesting looking semi-sweet onions.
The cipollini onion is considered somewhat of an exotic food but becoming more mainstream as time goes by.
They contain more sugar vs white, green, spring or yellow onions, but like all onion varieties cipolline's are comparatively very low in calories.
30 calories per serving, with 7g of Carbohydrates, 1g dietary fiber and 5g sugar and containing 10% of daily recommended Calcium needs.
The sweetness is somewhat less than shallots' and similar to red onions and vidalia onions but a bit milder.