Clean the carrots, peel them and cut them in half lengthwise. Clean, peel and cut kohlrabi into small pieces. Cook both in boiling salted water for about 10 minutes. In the meantime clean and wash the mangetouts.
Add to the vegetables approx. 3 minutes before the end of the cooking time and cook. Drain and collect the vegetable water. Wash the meat and dab dry. Fry all around in hot oil for about 10 minutes.
Season with salt and pepper. Fry over medium heat for about 10 minutes. In the meantime wash and chop the chervil. Remove the fillet and keep warm. Roast breadcrumbs in the frying fat until golden brown. Fold in chervil and spread on the fillet.
For the sauce, heat the fat. Sweat flour in it. Deglaze with cream, white wine and 1/4 litre vegetable water. Bring to the boil while stirring constantly. Season to taste with salt and coloured pepper. Warm up the vegetables.
Cut the fillet open and arrange on the vegetables with sauce. Serve sprinkled with coloured pepper and chervil.