Wash the asparagus, cut off the woody lower ends. Pour into boiling salted water and cook for about 12 minutes. Then pour into a sieve and drain well. In the meantime, roast the pine nuts in a pan without fat until they are golden yellow, take them out.
Clean, wash and slice the tomatoes. Clean and wash the rocket and let it drain well in a sieve. Wash the chives and cut into fine rolls. Peel and finely dice shallots.
Heat the oil in a small pan and sauté the shallots until translucent. Deglaze with vinegar, stir in sugar and bring to the boil. Add chives and season with salt and pepper. Remove from the heat and allow to cool slightly.
Cut the asparagus into pieces. Mix asparagus, tomatoes and rocket. Add vinaigrette, mix and arrange on 4 plates with 2 slices of Parma ham each. Sprinkle with pine nuts and Parmesan cheese and serve garnished with chervil.