Add all the peels to the water and simmer for 30 minutes over low heat. Strain the broth through a sieve and press the peels well. Cut the tops of the asparagus to about 5 cm and set them aside. Cut the rest of the asparagus into pieces.
Sautรฉ the sweet onion in the olive oil, add the drained cashews and the pieces of asparagus, and moisten with the asparagus broth.
Let it simmer gently for 10 minutes, add the lemon juice, season, and blend very finely. The best result is achieved with a blender.
Divide the soup among the bowls.
Finishing: Cut the tips of the asparagus into fine slices and sprinkle them as a decoration over the soup. Drizzle with a few drops of olive oil.
Tips
Every time you prepare your asparagus, keep the peels in the freezer. As soon as you have a lot, you can make soup out of it. This soup can be made with both white and green asparagus. She is also very cold served as a snack.