Radicchio is a perennial cultivated form of leaf chicory sometimes known as Italian chicory because of its common use in Italian cuisine. It is grown as a leaf vegetable and usually has colorful, white-veined red leaves that form a head. Radicchio has a bitter and spicy taste that mellows if it is grilled or roasted.Radicchio is rich in vitamin K, a good source of dietary fiber, and it contains antioxidants.