Fry the minced meat with the diced onion. Add the cleaned and cut cabbage and fry it hot. Peel the kohlrabi, cut into cubes and also add. Add the processed cheese and simmer very gently.
In the meantime, peel the potatoes, slice them into fine slices and use them to line a greased casserole dish (bottom and side walls). Sprinkle the potato slices lightly and evenly with salt.
Season the minced cabbage mixture with salt and pepper and pour into the baking dish. Now put another layer of planed potatoes on top and sprinkle with salt. Mix the sour cream with the grated cheese, season with salt, pepper and spread over the top layer of potatoes. Cook at 180 ° C (top / bottom heat).