Peel the asparagus and cut into pieces about 3 centimeters long. Cut the bell pepper into strips. Chop the spring onions into small pieces.
Lightly heat the butter in a large pan, add the asparagus, paprika, spring onions and ginger, season and fry for 15 minutes over a low to medium heat, swirling several times.
Add the asparagus stock and lemon juice. Let it murmur for 5 to 10 minutes (depending on your taste).