Preheat the oven to 425°F.
In a food processor or blender, add the basil and garlic. Turn on low speed and blend until finely chopped, 15 to 20 seconds. Add the cashews and lemon zest and blend until cashews are finely chopped and the mixture has a crumbly, dough-like consistency.
Transfer the cashew-basil mixture to a large mixing bowl. Add the bacon, ground beef, ground pork, salt, pepper, red pepper flakes, dried oregano, eggs, and arrowroot flour. Using clean hands, mix the meat until well combined.
Coat the bottom of a 9×13-inch baking dish with olive oil.
Use an ice cream scoop to gather and form a 2-inch round meatball. Place the meatball in baking dish and repeat with the remaining meat.
Transfer the dish to the oven and cook, uncovered, until the meatballs are browned, about 20 minutes.
Remove from oven and reduce the oven temperature to 325°F. Pour the marinara evenly over meatballs. Return the meatballs to the oven and continue to bake, uncovered, until the meatballs are tender and the sauce is hot and bubbly, about 45 minutes.
Remove from the oven and let cool for 5 to 10 minutes before serving. Garnish with freshly chopped parsley and basil. Serve as desired and enjoy!