Roast pine nuts in a pan without fat. Wash the sorrel, dab dry and pluck the leaves from the stalks. Put some leaves aside for garnishing. Grate the parmesan. Puree pine nuts (except for a little garnish), sorrel and parmesan. Add olive oil slowly. Season with salt and pepper.
Heat tortellini in salted water for 1 minute. In the meantime, wash the cherry tomatoes and dab dry. Heat the oil in a pan and fry the tomatoes briefly all around. Mix tortellini, cherry tomatoes and 2/3 of the pesto. Form Parma ham into florets and arrange with the tortellini. Garnish with sorrel leaves, pine nuts and the remaining pesto