Wash the potatoes and cut into thin slices. Chop onion. Cut ham into cubes
Place the potatoes, onion and ham in a small greased casserole dish. Season the milk with salt, pepper, nutmeg and pour over the potatoes
Bake the gratin in a hot oven (electric cooker: 200 °C/ convection oven: 175 °C/gas: level 3) for 40-45 minutes. Sprinkle cheese slices over the gratin 15 minutes before the end of cooking
Wash the carrots, grate them. Chop the nuts and mix them in. Season to taste with sweetener and lemon juice. Wash and chop the parsley. Sprinkle over the potato gratin. Add the raw carrots
The gratin becomes piquanter with Roquefort or Appenzeller cheese instead of Gouda