Clean the Brussels sprouts and cook them briefly in salted water. Sear the smoked pork loin in a little clarified butter, then remove it from the pan. Cut the onion into small cubes and sauté in the remaining frying fat.
Prepare a sauce from the processed cheese and milk. Season with salt (a little!) And pepper.
Place the Brussels sprouts in a baking dish and place the slices of cheese on the cabbage like a roof tile. Spread the onion cubes on the smoked pork. Pour the sauce over it.