You can watch the short video for visual instructions.First, peel the asparagus stalks below the tips and trim the woody ends. Then, cut into 1-inch pieces and set the tips aside. Also, finely dice the onion. You can optionally make an asparagus broth by simmering the peels and ends in 750 ml of water (or vegetable broth) with a little salt and sugar for about 20 minutes. Then strain and use.
Meanwhile, heat the oil/butter in a heavy-based pan over medium heat.
Sauté the onion until translucent (4 minutes).
Add the asparagus pieces (not tips), de-glaze the pan with a little broth, add the remaining broth, and simmer for 15-20 minutes, adding the asparagus tips in the last 5 minutes. Reserve some/all to garnish the creamy asparagus soup.
Using an immersion blender/ blender, puree the soup until smooth. Meanwhile, combine the starch and cream until lump-free.Safety tip: When using a blender, only fill halfway (work in batches if necessary). Hold the lid with a towel, and pause occasionally to lift the lid, letting steam escape. Add the starch mixture to the soup and bring it to a boil, stirring constantly, until thickened.
Add the reserved asparagus tips and season with the lemon juice and salt, pepper, sugar, and freshly grated nutmeg. I use ¼ tsp each, but adjust to taste.
Serve in bowls, sprinkle with fresh herbs, and enjoy!