Cheese Tortellini with Walnut Pesto

Ingredients

• 1 tablespoon butter
• ¼ teaspoon fresh-ground black pepper
• ¹/₃ cup lightly packed flat-leaf parsley with thick stems removed
• ½ cup olive oil
• ½ teaspoon salt
• 1 cup walnuts
• 1 pound fresh or frozen cheese tortellini
• + 2 more ingredients
• • 2 cloves garlic, smashed
  • 3 tablespoons grated Parmesan cheese, plus more for serving

1. In a food processor or blender, pulse the walnuts, parsley, garlic, Parmesan, oil, salt, and pepper to a coarse puree. 2. In a large pot of boiling, salted water, cook the tortellini until just done, about 4 minutes for fresh and 12 minutes for frozen. Reserve 1/2 cup of the pasta water. Drain...

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