If using dried morels, do not discard the soaking water. Strain it carefully and add a splash to the soup for extra mushroom flavor, ensuring no grit remains.
For a smoother texture, ensure the soup is passed through a fine-mesh sieve after blending to remove any fibrous bits from the asparagus stalks.
This soup is best served immediately while hot to preserve the delicate flavor of the fresh asparagus.
Vegetable stock can be substituted for water when cooking the asparagus for a richer base flavor.