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Bring a large pot of salted water to a boil. Add potatoes and cook until tender but still firm, about 15 minutes. Drain, and let cool.
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Once cool, peel and grate potatoes.
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Melt 3 tablespoons of butter in large nonstick skillet, add a layer of potatoes and a layer of cheese, sprinkle with salt and pepper.
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Repeat layers.
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Dot each layer with remaining butter.
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Sprinkle 2 tablespoons hot water over the top layer, cover and saute at low to medium heat until bottom layer browns.
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Turn with spatula and brown again.