INGREDIENTS
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1/2 stick unsalted butter
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3 tablespoons all-purpose flour
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2 1/2 cups whole milk
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1/4 pound Italian Fontina, coarsely grated (about 1 cup)
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3 ounces Gruyère, coarsely grated (about 1 cup), divided
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Scant 1/2 teaspoon grated nutmeg
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3 garlic cloves, thinly sliced
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3 tablespoons olive oil
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10 ounces cremini mushrooms, thinly sliced
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8 ounces seitan (patted dry and thinly sliced)
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1/2 teaspoon thyme leaves
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3 tablespoons water
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2 (16-to 18-ounce) logs ready-made plain polenta