METHOD
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preparation
Cut the ham into small cubes, about 1 cm x 1 cm (½ x ½ inch). Finely chop the onion. Peel the potatoes and slice them to about 2 mm thickness (about 1/16 inch) using a mandoline—alternatively, you can use a knife. It’s important not to rinse the sliced potatoes.
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saute
Place a large pan over medium heat. Add the oil, chopped onion, and ham. Sauté over low heat for about 5 minutes, then remove from the heat.
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potato
Place the potatoes in a bowl and season with salt, pepper, thyme, and nutmeg. Add the minced garlic cloves along with the sautéed onion and ham. Pour in the heavy cream and add 150 g (about 5 oz) of grated cheese. Mix everything well until the ingredients are evenly combined.
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scalloped potatoes
In a deep baking dish, approximately 20 cm x 25 cm (about 8 x 10 inches), tightly layer the potatoes in multiple layers. Pour any remaining liquid from the bowl over the potatoes, then evenly sprinkle the remaining grated cheese on top. Bake in a preheated oven at 180°C (350°F).
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bake
Place the rack in the middle of the oven and preheat it to 180°C (350°F). Place the baking dish with the potatoes inside a larger deep roasting pan, then pour water into the outer pan until it reaches about 2 cm (around ¾ inch) high. Transfer to the preheated oven and bake for 1 hour and 15 minutes, covered first with baking paper, then with aluminum foil. After that, uncover the potatoes and bake for another 30–45 minutes, or until the potatoes are soft and fully cooked through.
TipBefore removing the potatoes from the oven, check that they are fully cooked. A knife should slide through the potatoes all the way to the bottom with minimal resistance.