INGREDIENTS
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2 tablespoons extra-virgin olive oil
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3 tablespoons all-purpose flour
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1 cup whole milk
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1/4 cup plus 1 tablespoon freshly grated Parmesan
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20 fresh sage leaves, plus 1 tablespoon chopped fresh sage
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Coarse salt and freshly ground pepper
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2 pounds sweet potatoes, peeled and sliced 1/4 inch thick
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1 head cauliflower, quartered and sliced 1/4-inch thick
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Vegetable oil, for crisping sage