Preheat the oven to 200 degrees. Grease a large, flat baking dish. Wash and peel the potatoes and apples. Halve the apples and remove the cores. Slice the apples and potatoes into thin slices. Wash and clean the onions and cut into oblique rings. Mix the cream with milk, season with salt and pepper.
Layer the apple and potato slices into the baking dish like a roof tile, sprinkle onion rings between them. Pour cream milk onto the gratin. Bake the gratin in the oven (center, fan oven 180 degrees) for about 45 minutes.
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