INGREDIENTS
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1 1/2 pounds sweet potatoes (yams) halved lengthwise
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1/2 pound Russet potatoes halved lengthwise
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1 tablespoon olive oil
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2 teaspoons Kosher salt plus more to taste
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Freshly ground black pepper as needed, plus more for garnish
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1/4 cup finely grated Parmigiano-Reggiano cheese plus more for garnsish
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1 large egg lightly beaten
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3 tablespoons honey
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1 1/2 to 2 1/2 cups all purpose or white whole wheat flour
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4 tablespoons unsalted butter
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12 to 15 fresh sage leaves
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2 medium shallots quartered and thinly sliced
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3 tablespoons balsamic vinegar