Roast the pine nuts in a pan without fat, take them out and let them cool down. Wash, clean and halve the tomatoes. Drain mozzarella balls. Wash, clean and drain the rocket.
Finely chop the pine nuts and mix with the pesto. Fold the mozzarella, tomatoes, rocket and pesto under 1/3 of the potatoes in marinade. Season to taste with salt and pepper. Serve with the Parma ham.