Peel and wash the potatoes and carrots. Cut everything into pieces and cook covered in salted water for about 20 minutes.
Pat the steaks dry. Heat clarified butter in a large pan. Fry the steaks for 2-3 minutes on each side. Season with salt and pepper. Remove and keep warm.
Deglaze the frying set with 1⁄4 l water, stir in the stock, bring to the boil. Stir in sauce thickener and simmer for 2-3 minutes. Season to taste with salt and pepper.
Drain the potatoes and carrots, leaving about 100 ml cooking liquid in the pot. Add sour cream and butter and crush everything coarsely. Season to taste with salt and nutmeg. Rinse cress and cut from the bed.
Arrange everything and sprinkle with cress.