Preheat the oven to 180C/160C Fan/Gas 4
Split the nectarines in half, remove the stones and place on a baking tray lined with baking parchment. Rub all over with olive oil and sprinkle with a little sea salt. Roast in the oven for 15 minutes.
Meanwhile, to make the walnut pesto, place the walnuts on a baking tray and toast in the oven for 5-8 minutes. Set aside and leave to cool. Chop the nuts finely. Mix the Parmesan, walnuts and olive oil in a bowl and stir to combine.
Make the dressing by whisking together the olive oil, pomegranate molasses and sea salt. Place the rocket in a bowl. Just before serving, pour some of the dressing over the leaves just to coat.
To serve, place a bed of rocket salad on each plate and sit 2 roasted nectarine halves on top. Break up the mozzarella into chunks and place it around the leaves. Spoon over some walnut pesto and then drizzle with some pomegranate molasses. Can be served on individual plates or on a platter for everyone to help themselves.
Note: An alternative way to prepare the nectarines is to griddle them. Preheat the griddle until smoking. Rub the nectarines with olive oil. Place flesh side down on the hot griddle for 2-3 minutes. Remove from the griddle and continue as above.