Wash morels well and soak them in lukewarm water for about 30 minutes. Wash and peel the asparagus and cut off the woody ends. Peel and wash the carrots. Cut both into bite-sized pieces. Clean and wash the cauliflower and cut it into small florets
Bring 1.5 l salted water to the boil. Cook the vegetables one after the other: asparagus for about 10 minutes, carrots and cauliflower for about 15 minutes each, peas for about 5 minutes. Lift out the vegetables, keep warm
Whisk the egg yolk and 4 tablespoons of cream. Heat the fat and stir-fry the flour in it until golden brown. Deglaze with vegetable water and the rest of the cream and bring to the boil. Simmer for about 5 minutes.
Rinse and drain the morels again. Heat well in the sauce. Stir the egg yolks into the no longer boiling sauce. Season to taste and fold in the vegetables