Cheap Asparagus Soup is made from the stems of asparagus which normally get discarded, meaning it can be made for next to nothing!
By the time it's boiled up, most of the asparagus is quite tender, but if you are sensitive to texture then consider pressing the soup through something like a conical sieve to ensure all fibrous pieces are removed.
The soup has a mild flavour which goes very well with something fresh tasting - lemon juice, sour cream or crème fraîche all work well.