Instructions:
Instructions:
Prepare the potatoes:
Peel and slice the potatoes into thin rounds (2–3 mm).
Rub a gratin dish with the garlic clove and lightly butter it.
Prepare the cheese sauce:
In a saucepan, combine the cream and milk.
Add half of each grated cheese (Parmesan, Gruyère, Mozzarella, Bleu), season with salt and pepper, and add a pinch of nutmeg.
Heat gently until the cheeses melt slightly.
Assembling the gratin:
Arrange a layer of potatoes in the dish, then pour over some of the cream and cheese mixture.
Repeat until all the ingredients are used, finishing with a layer of cream.
Sprinkle the remaining cheeses on top.
Baking:
Preheat the oven to 180°C (350°F).
Cover the dish with aluminum foil and bake for 45 minutes.
Remove the foil and continue baking for 15 to 20 minutes to achieve a nice golden crust.
Serving:
Let the gratin rest for 5 minutes before serving to allow it to set.
