Let the smoked ham simmer in the lightly boiling broth for about 20 minutes.
In the meantime, peel and dice the potatoes and cook them in salted water until they are soft.
Wash, clean and roughly chop the beans. Cook in boiling salted water for about 7 minutes.
Cut the smoked pork into thick slices and place in the middle of a greased baking dish.
Melt 25 g butter, sweat the flour in it and gradually stir in the stock and milk. Let the sauce simmer for 10 minutes.
Preheat the grill.
Season the sauce with mustard, horseradish, salt and pepper. Then add the potatoes and beans. Spread around the Kasseler in the mold. Spread the remaining butter in flakes and sprinkle the breadcrumbs on top.