Take the pot with the asparagus broth and add the peel to it.
Bring it to boil and simmer for 15 minutes. Take the peel out of the pot.
Pour the broth from the pot into a large bowl and take the pot and heat it up to medium. Add butter, let it melt.
Add flour and stir to combine. Wait until the mixture boils. Keep on boiling and stirring for 3-4 minutes.
Add the asparagus broth with the ladle one-by-one and keep on stirring vigorously.
As soon as you added the whole thing ass cream, bring it to boil. At this point your soup is ready. You can store it in the fridge up to 3 days or freeze it if you wish.