A member of the endive (chicory) family, radicchio is a tight head of crisp leaves that are a vibrant red or reddish-purple with white veins.
They have a bitter, nutty taste that teams particularly well with citrus fruits.
Treviso is a variety of radicchio with long, elongated leaves and a slightly milder flavour.
Radicchio is high in beta-carotene and other cancer-fighting phytochemicals.