Radicchio is a leaf chicory (Cichorium intybus, Asteraceae), sometimes known as Italian chicory. It is grown as a leaf vegetable which usually has white-veined red leaves. It has a bitter and spicy taste, which mellows when it is grilled or roasted. It can also be used to add color and zest to salads. a chicory of a red variety with variegated leaves that is used as a salad green.