1. Pre-heat Broiler.
2. Pull out any bad leaves from the radicchio, then cut it into quarters lenghthwise.
3. In a small bowl: add orange juice, olive oil and orange zest, stir well.
4. Brush the radicchio with the oil mixture, season with salt and pepper.
5. place radicchio wedges on a broiler rack and broil 8 minutes rotating often.
6. Meanwhile, assemble the sandwiches: place the turkey on the toasts, top with Provolone, and broil until cheese is bubbly.
7. Transfer radicchio and open faced sandwiches to dinner plates, and drizzle with the remaining dressing, serve with oranged.