128 Kohlrabi Whole (without root) Food In Brussels sprouts it is the miniature axillary heads (leaves) which are consumed as a cooked vegetable. The kales are a polymorphic group comprising vegetable types (curly kale, collard) and types mainly used as fodder crops (thousand-headed kale, marrowstem kale, collard). The vegetable types are grown for their smooth or curly foliage, usually consumed cooked. Kohlrabi is principally grown for its swollen stem, which is used cooked. 6,867