Wash and peel the asparagus, cut off the lower woody ends. Peel potatoes and wash thoroughly. Bring to the boil in a pot of salted water, cover and cook over medium heat for about 20 minutes.
Bring salted water and a pinch of sugar to the boil in a wide saucepan. Add the asparagus and cook for 15-18 minutes. Wash the meat, dab dry and cut into 8 medallions. Put 125 ml water and orange juice in a pot.
Stir in the sauce powder. Bring to the boil while stirring continuously. Beat butter in pieces over low heat until well done. Keep sauce warm. Heat oil in a coated pan. Fry the meat on each side for about 2 minutes.
Then season with salt and pepper. Drain the potatoes. Carefully pour the asparagus into a sieve and drain. Arrange asparagus, potatoes, meat and sauce. Serve garnished with chervil, orange slice and peel.