Radicchio is a type of chicory that is commonly used in Italian cuisine, and it is a key ingredient in many salads in Venice. The Radicchio salad is a simple yet flavorful combination of radicchio leaves, shaved Parmesan cheese, and a tangy vinaigrette dressing. The bitterness of the radicchio is balanced by the richness of the Parmesan cheese, creating a delicious and satisfying salad.