Cut asparagus tips from stalk. Cut stalk into 1 cm pieces.
Cook sausage and onion in oil until sausage is nearly cooked and onion softened.
Deglase pan with white wine and cook until nearly evaporated.
Remove sausage and onion from pan and set aside.
Add oil and asparagus tips to pan, adding salt as needed, and cook until al dente (3 - 4 minutes).
Remove from pan and set aside.
Add oil and cut up stalks. Add some water (about one ladle full). Cook for about 10 minutes. (Add some salt as needed.
Start tortiglioni
Take cooked stalks, basal leaves, a few drops of oil, salt, and pepper and blend with an immersion blender until smooth.
Add sausage, onion, and asparagus tips to pan with a little oil. Stir in the cooked tortiglioni and mix.
Add the blended stalks and basil to the pasta and mix well.
