Clean, wash and drain the carrots, celery and leek. Cut vegetables into fine strips (julienne). Wash, peel and halve the potatoes. Cover and cook in little boiling salted water for about 20 minutes.
Heat clarified butter in a large frying pan. Fry the Kasseler steaks in it while turning them. Remove the steaks and wrap them in aluminium foil. Sauté the julienne vegetables in hot frying fat, dust with flour and sauté briefly while stirring.
Deglaze with broth and cream. Add capers and simmer covered over a low to medium heat for about 5 minutes. Stir in between. Then stir mustard into the sauce and simmer for another 1-2 minutes.
Season to taste with salt and pepper. Wash parsley, shake dry and chop except for something to garnish. Drain the potatoes and let them steam briefly on the hot stove. Arrange smoked pork steaks with julienne vegetables and boiled potatoes on plates.
Sprinkle with parsley and garnish.