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Place 2 tablespoons of clarified butter in the bottom of a round casserole dish.
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Line bottom of dish with russet potatoes, overlapping in circular layers until the bottom is covered.
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Next layer sweet potatoes on top of russet potatoes in a circular layer.
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Brush the potatoes with 2 tablespoons of clarified butter, then top with chopped rosemary (approximately 1 teaspoon), salt and pepper
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Now follow steps 2, 3, 4.
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Follow steps 2, 3, 4 again.
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Bake, uncovered at 450 for 45 min or until the potatoes are tender.