Wash and peel the asparagus and cut off the woody ends. Cook the asparagus in boiling salted water with some sugar and a slice of lemon at medium heat for about 20 minutes. In the meantime, wash and finely chop the chervil and parsley. Bring 3/8 litres of water and 1/2 teaspoon salt to the boil. Remove the pot from the heat. Add milk and herbs. Stir in puree flakes.
Let it swell for 1 minute and stir again. Chop hazelnuts and pistachios. Melt butter. Arrange asparagus and puree on plates. Sprinkle with nuts. Pour melted butter over them and sprinkle with chervil leaves