Peel the asparagus, cut off the woody ends and cut the asparagus into pieces. Put the asparagus in boiling salted water and cook for 12-15 minutes at low heat. In the meantime, cut the crab meat into small pieces.
Wash and sort watercress. Chop the pistachios. Mix vinegar, salt and pepper and add oil. Add the pistachios to the vinaigrette. Drain the asparagus. Pour the vinaigrette over the prepared salad ingredients and mix everything well.
Arrange the salad on a plate.