Kale Pesto Pasta

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1. 1
   Bring a large pot of salted water to a boil for the pasta. Once boiling, add the pasta and continue to boil until the pasta is tender. Drain in a colander and let cool.
2. 2
   While the pasta is cooking, prepare the pesto. Pull the kale leaves from the woody stems, and roughly chop into thin strips. Place the kale in a colander and rinse with cool water. Let the excess water drain away.
3. 3
   Add the chopped and washed kale to a food processor along with the olive oil, 1/4 cup juice from the lemon, garlic, walnuts, Parmesan, salt, and pepper. Purée the mixture until smooth and bright green. Add more oil if needed to allow the mixture to become a thick, smooth sauce. Taste the pesto and adjust the salt, pepper, or lemon juice to your liking. Set the pesto aside.
4. 4
   Once the pasta is drained and cooled to the point where it is no longer steaming, transfer it to a large bowl. Add about half of the pesto and stir until the pasta is coated. 
5. 5
   Dice the mozzarella into small cubes, then add it to the pasta along with about 1 Tbsp of the zest from the lemon. Stir to combine with the pesto pasta. Add more pesto until everything is coated in a thick layer. Top with more freshly cracked pepper and serve, or refrigerate until ready to eat.