INGREDIENTS
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1/4 cup walnuts
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3 tablespoons flaxseeds
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4 cups (3 ounces) packed flat-leaf parsley leaves
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2 cloves garlic
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1/3 cup grated Parmesan, plus more for serving
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3/4 teaspoon coarse salt, plus more for pasta water
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1/4 teaspoon ground pepper
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1 pound linguine
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Grated Parmesan cheese (optional)