Clean the carrots (leave some green at the top if you like) and wash them. Clean, wash and chop the kohlrabi. Clean and wash the sugar snap peas. Peel, wash and slice the potatoes.
Heat 1 tablespoon of oil in a frying pan and fry the potato wedges in it over medium heat for about 20 minutes while turning. Season with salt and pepper. Cook the carrots and kohlrabi in boiling salted water for approx. 12 minutes. Add the sugar snap peas 5 minutes before the end of the cooking time.
Wash the meat, dab dry. Heat the remaining oil in a pan and fry the meat in it over medium heat for 3-4 minutes on each side. Then season with salt and green pepper. Remove meat from the pan and keep warm.
Deglaze roast with stock, bring to the boil, stir in sauce thickener and season with salt and pepper. Foam up fat. Arrange potatoes, vegetables with sauce, meat and butter on a plate and serve garnished with chervil as desired.