Heat half a tablespoon of oil in a skillet, add chopped mushrooms and parsley and cook for 8 minutes. Season with salt and pepper to taste.
In a food processor, blitz the remaining oil, crushed garlic, nutritional yeast, spinach, lemon juice, and walnuts into a creamy pesto.
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{{/ items}} {{^ items}} {{/ items}}Cook the pasta in a pot of salted boiling according to packet instructions. Once ready, drain the pasta, saving some of the cooking water for the sauce.
Once the mushrooms are cooked, remove the pan from the heat and add the pesto.
Then, add the pasta and some of the cooking water. Stir until well coated.