Cut the onions into rings and fry them in a little fat, add the sauerkraut and stew until the cabbage is cooked through. Season with granular broth in between and deglaze with a little water again and again.
Season the mince with salt, pepper and ketchup, knead and then fry in a pan with a little fat for about 10 minutes. After a few minutes add the potato noodles and fry for about 5 minutes.
Put the cabbage and minced noodle mixture in a baking dish.
Warm the milk in a small saucepan and melt the cheese over a low heat.
Grate the Gouda cheese, pour over the casserole and pour the cheese sauce over it.
Place in the oven at 180 ° C for about 30 minutes (until the cheese is lightly browned).
You can of course use another cheese instead of the Gouda.