Wash the potatoes and cook in plenty of boiling water for about 20 minutes. Rinse under cold water, drain and peel. Clean, wash and quarter the cabbage, cut out the stalk.
Cut cabbage into large cubes. Wash meat, dab dry and cut into cubes. Heat clarified butter, fry the smoked pork loin for about 10 minutes while turning. After 5 minutes add the cabbage. Add stock, bring to the boil and simmer for about 5 minutes.
Season with mustard, salt and pepper. Add cream. Cut the potatoes into slices. Layer cabbage, potatoes and cheese, up to 1/4, alternately in the greased casserole dish. Spread the remaining cheese on the casserole.
Cook in the preheated oven (electric cooker: 175 °C/ convection oven: 150 °C/ gas: level 2) for 30-45 minutes. Arrange on plates.