Radicchio has tender but firm leaves that ar are comparable to Belgian Endive or escarole and are bittersweet in flavor.
Radicchio (di Verona)
Radicchio is a popular salad green. Available in a wide range of colors including various shades of pink, red and green, the burgundy-red leafed Radicchio (with white ribs) is most common. Radicchio di Verona as it is sometimes referred to is a loose head that resembles small butterhead lettuce in both size and shape.