Step 1Trim any coarse or discolored parts from the bulb or stalks of the fennel and discard them. The feathery leaves of the fennel bulb are flavorful and add color to the salad. Cut the bulb and ribs (also called stalks) into thin slices. Place the slices in a large salad bowl. Use some of the fennel leaves and add them to the bowl.
Step 2Rinse the radishes and trim away the roots and the stem tops. Thinly slice the radishes and add them to the bowl. Rinse the parsley, shake it free of water and pick just the leaves off and add them to the bowl.
Step 3Tear the prosciutto slices into pieces and add them to the bowl.
Step 4Combine the lemon juice and olive oil. Season the salad with salt and pepper to taste, then pour the dressing over the salad and toss thoroughly to coat the ingredients.
Step 5Break the cheese into 2-inch pieces and sprinkle over the salad. Chill the salad for 1 hour, then serve it cold. Toss it again just before serving.