Wash the steaks, dab dry and rub with pepper. Heat clarified butter in a frying pan and fry the steaks for approx. 4 minutes on each side. Peel onions and cut into rings.
Clean, wash and slice the mushrooms. Take the steaks out, salt and keep warm. Sauté onions and mushrooms in frying fat and take out. Deglaze the cooking fat with cognac and broth.
Add the sauce thickener while stirring and bring to the boil. Season to taste with salt and pepper. Arrange the steaks with the mushroom vegetables and the sauce on plates. Garnish with parsley. Serve with croquettes and a tomato salad.