For the bouillon, put the asparagus peels in cold water and bring to the boil.
Boil briefly.
Pour though a funnel sieve and collect the asparagus bouillon.
Sauté the onion, leek and celery in Debic Roast & Fry and add the asparagus bouillon.
Add the Debic Végétop and boil until the vegetables are cooked through.
Purée with a hand blender and pass through a fine sieve.