Heat the oven to 375°F/190ºC.
Spill half the potato slices into a gratin dish.
Season well with salt, pepper, and nutmeg.
Smear over the grated garlic.
Spread over the remaining potato slices.
Pour over the milk and cream.
Season well again with salt and pepper.
Dot with the butter.
Bake until all the liquid has been absorbed and the top is bubbly brown, 1 to 1-1/2 hours.
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