Calabrese is a broccoli-like vegetable with large, densely packed, usually blue green heads and few outer leaves. May be white, green or purple. Sprouting broccolis have masses of small florets growing over a long season, while calabrese is a summer vegetable with a heavy central head. Calabrese, as well as broccoli, can be deep purple, lime green or white. The prettiest are the "Romanesco" types.