Peel and wash the potatoes. Cook in boiling salted water for about 15 minutes. Peel the carrots so that some greenery remains. Wash the carrots, cut in half lengthwise and cook in the vegetable stock for about 10 minutes.
Seasoning. In the meantime, wash the steaks and pat them dry. Clean and wash spring onion, cut into small pieces. Heat oil. Fry the steaks on each side over a high heat for 1-2 minutes.
Season with salt and pepper. Add spring onions and fry everything for 2 more minutes. Add green pepper. Boil off the gravy with the vegetable stock of the carrots. Thicken slightly with sauce thickener. Serve medallions and vegetables garnished with chervil.