Simmer the asparagus in salted water. Drain. Cut off and save the tender tips. Mash the stems through a coarse sieve.
Place onion slices in the milk and scald; remove onion. Add the asparagus pulp to the milk.
Blend together butter and flour, stir in a little hot milk to make a paste, and add slowly to the soup while stirring. Bring to a boil, add evaporated milk and most of the asparagus tips.
Season to taste with salt and pepper. Garnish with asparagus tips.
Keyword cream of asparagus soup, cream of asparagus soup healthy