Colossal onions are huge in size, averaging more than 1 kg each, and are globular to slightly oblong in shape. The softball-sized bulbs are encased in a thin, yellow papery skin that is flaky, dry, and brittle. Underneath the skin, the off-white flesh is juicy, crisp, and firm with many layers of even rings that can be easily separated. Colossal onions have warm and sweet aromatics, due to the presence of the compound eugenol, and are known for their trademark sweetness and succulent, tender texture.
Colossal onions are specially grown for the famous "blooming onion" dish a blooming onion, onion bloom, onion blossom, onion flower, bloomin' onion, or onion mum is a dish consisting of one large onion which is cut to resemble a flower, battered, and deep-fried. It is served as an appetizer at some restaurants.
They will keep 1-2 months from their harvest date when stored in a cool, dry, and well-ventilated place.