Wash the asparagus, cut off the woody lower ends. Wash the tomatoes and possibly halve them. Wash the meat and dab dry. Heat the oil in a pan and fry the meat well all around.
Then cook over medium heat while turning for about 8 minutes. Season with salt and pepper. Remove from the pan and keep warm. Add tomatoes to the frying fat and fry briefly. Season with salt and pepper.
In the meantime, put the asparagus in boiling salted water and cook for about 12 minutes. Put sauce powder and 150 ml cold water into a small pot and mix. Bring to the boil while stirring. Add butter in pieces at low heat and fold in until melted.
Wash the chives, dab dry and cut into small rolls. Wash the chervil, dab dry and chop finely. Pour the asparagus carefully into a sieve and let it drain. Cut the meat open. Serve asparagus, meat, tomatoes and sauce sprinkled with herbs on a plate.