Gruyere Potato Gratin
- 1 pound large red potatoes
- 3/4 cup coarsely grated Gruyere (about 3 ounces)
- 1 large egg
- 3/4 cup milk, heated just to boiling
- Salt and freshly ground black pepper
Bring a large saucepan of salted water to a boil. Peel potatoes and cut into thin slices (about 1/8-inch thick). Add potatoes to boiling water and parcook 4 minutes. Drain potatoes well in a colander.
In gratin or baking dish, arrange potatoes, overlapping them, in 3 layers, sprinkling first 2 layers each with 1/4 cup Gruyere and salt and pepper, to taste.
In a small bowl whisk egg and add hot milk in a stream, stirring constantly. Season mixture with salt and pepper and pour evenly over potatoes. Sprinkle the potatoes with remaining 1/4 cup cheese and bake until top is golden and potatoes are tender, about 30 minutes.
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