In a food processor, combine the cilantro leaves, shelledpistachios, garlic, and vegan Parmesan cheese (if using). Pulse the ingredientsuntil they are finely chopped and well combined. While the food processor isrunning, slowly drizzle in the olive oil until the mixture forms a smoothpaste. Add the fresh lemon juice and continue to blend until the pesto reachesyour desired consistency. Season with salt and pepper to taste, adjusting asneeded. Transfer the Pistachio Cilantro Pesto to a jar or container and store itin the refrigerator until ready to use.