Cut the asparagus into 3 cm pieces. Bring the salted water to the boil with the butter + cook the asparagus over low heat for 15 minutes.
Boil the eggs for 10 minutes.
Heat the margarine, add the flour while stirring, sweat + then stir again + slowly fill up with the milk / asparagus broth. Cook for 5 minutes + then season with salt, sugar + nutmeg. Whisk egg yolks, cream + some sauce + into the hot sauce.
Eighth eggs + asparagus in the sauce for 5 minutes. It is no longer allowed to boil! Season to taste + sprinkle with parsley.