Wash the asparagus and cut the ends off generously. Cut the asparagus, except for the heads, diagonally into thin slices. Peel, halve and slice the kohlrabis. Cook vegetables in 1/4 litre salted water for 5 minutes.
Wash the meat, dab dry and fry in hot oil for about 8 minutes. Season with salt and pepper. Take the vegetables out of the stock and let them drain. Measure out 1/8 litre of stock. Mix egg, egg yolk and vegetable stock and heat up on a water bath while stirring constantly.
No cooking! Stir in the cream. Season with salt and pepper. Cut the meat into slices. Put the kohlrabi, meat and asparagus in a flat casserole dish (28 cm Ø). Pour sauce over it. Sprinkle with parmesan.
Bake in the preheated oven (electric oven: 200 °C/ gas: level 3) for 30-35 minutes. Garnish with chervil.