Asparagus Soup with Lemon and Parmesan

Trim asparagus; cut the tips off one bunch and reserve for garnish
3 Tbs. unsalted butter sauté
~8 min
(don't brown)
simmer
30 min
purée
smooth
finish
with lemon
& parmesan
ladle &
garnish
2 medium yellow onions, chopped
3 cloves garlic, smashed
~2 bunches asparagus, cut in 1/2-in pieces
6 cups low-sodium chicken broth
1 tsp. salt
1/4 tsp. black pepper
2 Tbs. lemon juice
1/2 cup shredded Parmigiano-Reggiano
from 1 bunch reserved asparagus tips blanch &
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fresh herbs (thyme, dill or basil), optional