The cultivated vegetable descends from a wild herb related to the turnip that grew either in China or the Mediterranean region. Rapini is similar in shape to the Chinese Brassica oleracea cultivar called kai-lan. Rapini is now grown throughout the world. Broccoli Raab is commonly marketed in English as Rapini is a green cruciferous vegetable. The edible parts are the leaves, buds, and stems. The buds somewhat resemble broccoli, but do not form a large head. It is known for its slightly bitter taste and is particularly associated with Italian, Galician and Portuguese cuisines. Within Italian cuisine, the plant is heavily associated with Southern Italian cuisine, especially Neapolitan cuisine and the cuisines of Campania and Puglia, and Roman cuisine. Delicious broccoli raab recipes.