Clean, wash and drain the zucchini well. Cut the zucchini lengthwise into 2-3 mm thin slices (best with a slicer). Heat a grill pan and brush with oil. Grill the zucchini slices in portions while turning for about 4 minutes, place on a large plate
Mix vinegar, salt, pepper and sugar. Embezzle olive oil. Drizzle the vinaigrette over the zucchini and leave to stand for 15-20 minutes
Roast pine nuts in a pan without fat, remove immediately. Clean and wash the radicchio and drain well. Pluck leaves into large pieces. Wash the basil, shake dry and pluck the leaves. Put pine nuts and some basil leaves aside for sprinkling
Carefully mix the radicchio, remaining basil and pine nuts with the marinated zucchini slices. Arrange the salad on a large plate and sprinkle with parmesan slices and basil. Serve with fresh bread (e.g. olive ciabatta)