in a small bowl, whisk together all vinaigrette ingredients. note: recipe will make more than needed for salad - store in a jar on the countertop and use for other salads, or as a dipping sauce for steamed artichoke or raw vegetables.
trim off bottom of radicchio heads and wash and dry individual leaves.
in a mixing bowl, or on individual serving plates, drizzle a liberal amount of vinaigrette over whole radicchio leaves.
adding grated parmesan, gently toss salad and top with capers, a fresh crack of pepper and sea salt.