"An optional garnish of fried sage leaves takes this rustic gratin from simple to spectacular. Reprinted from Meatless: More Than 200 of the Very Best Vegetarian Recipes. Copyright © 2013 by Martha Stewart Living Omnimedia, Inc. Photos © 2013 by Johnny Miller. Published by Clarkson Potter/Publishers, a division of Random House, Inc...."
INGREDIENTS
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2 tablespoons olive oil
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1 tablespoon chopped fresh sage leaves, plus whole leaves for garnish
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3 tablespoons all-purpose flour
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Coarse salt and freshly ground pepper
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1 cup whole milk
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2 pounds sweet potatoes, peeled and sliced 1/4 inch thick
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1 cup water
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1 head cauliflower, trimmed, quartered, and sliced 1/4 inch thick
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1/4 cup plus 1 tablespoon finely grated Parmigiano-Reggiano
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Canola oil, for crisping