INGREDIENTS
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2 1/2 cups heavy cream (NOT ultra pasteurized for best results)
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3/4 cup finely chopped shallots or onions
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2 teaspoons chopped fresh rosemary (or 1 teaspoon dried)
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2 teaspoons celtic sea salt
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3/4 teaspoon ground black pepper
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4 pounds russet potatoes, peeled, cut into 1/4-inch-thick rounds
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2 cups (packed) grated sharp white cheddar cheese (about 8 ounces)