Brown ground chuck. Drain off fat. Salt and pepper to taste. Mix in ketchup. Set aside. Shred half of the cabbage into baking dish. Add meat, then the potatoes. Add slices of cheese next. Shred the rest of the cabbage on top of the cheese. Pour milk over all the layers. Cover and bake at 375 degrees for 1 1/2 hours. Add more ketchup, more cheese or different cheeses if desired. Makes 6-8 servings.