Line a baking sheet with a few layers of paper towel. Lay the zucchini noodles down and sprinkle with salt. Top with another few layers of paper towel, a cutting board and some heavy items like books or pots. Let sit for 10 minutes.
After 10 minutes, transfer the noodles to a colander and rinse thoroughly with cold water to remove the salt.
Refresh the paper towels on the baking sheet with a few new layers. Gently squeeze and shake the zoodles and lay them down on the paper towel. Top with a few more layers of paper towel, the cutting board and the heavy items. Let dry for 10 minutes.
If making the pesto, to a food processor, pulse the parsley, pistachios, garlic, lemon and nutritional yeast. Add in the olive oil and drizzle in the water until it reaches your desired consistency. Season with salt and pepper, to taste. Set aside.
For the avocado sauce, to a food processor, add the avocados, garlic, lemon, parsley, chives, oregano and nutritional yeast. Once fairly smooth, add the olive oil and puree until smooth. Season with salt and pepper to taste.
Heat a pan over medium high heat with the 2 teaspoons of oil. Add the zucchini and saute for 2-3 minutes as you toss the zoodles.
Transfer to the bowl with the avocado sauce and toss until well coated.
Transfer the zoodles to a serving dish, top with the pistachio pesto (if using), pistachios, olives and chives. Enjoy.