3Prepare the dipping vegetables: Wash and trim the Cardoons, peeling any tough outer strings, then slice them into bite-sized pieces. Wash and core the Red bell pepper and Yellow bell pepper, then slice them into strips. Peel the Carrots and slice them into sticks. Wash and trim the Celery stalks, then slice them into sticks. Wash and trim the Fennel bulb, then slice it thinly. Wash and separate the leaves of the Radicchio and Endive.