In a large bowl, mix together all of the meatball ingredients up to the coconut flour until well mixed. Add in the coconut flour and stir until well mixed. Form into 20 lightly heaping Tbsp sized balls (I used a cookie scoop.)
Heat a large, non-stick pan (or 2 mediums pans) over medium-high heat. Brown the meatballs on each side - about 1 minute per side- until golden brown. Add in the chicken broth, reduce the heat to medium/low and cover. Cook, stirring occasionally, until the meatballs are cooked and have absorbed the broth, about 8-11 minutes.
While the meatballs cook, add the black walnuts into a SMALL food processor (mine is 3 cups) and process until broken down. Add all the remaining ingredients up to the olive oil and pulse until broken down and combined.
With the food processor running, stream in the olive oil until well mixed.
In a large, high-sided frying pan, combine the coconut milk and chicken broth on medium/high heat. Bring to a boil.
Once boiling, whisk in all of the pesto until well combined and boil for 1 minute, stirring constantly. Then, reduce the heat to medium/low and simmer for 2-3 minutes, until the sauce begins to thicken up.
Heat a dry frying pan on medium high heat and cook the zucchini noodles until they just begin to soften, about 3-4 minutes. Transfer to a layer of paper towel and lightly press out the excess moisture. Divide between 4 bowls.
Stir the meatballs into the sauce and serve over the zoodles, garnishing with fresh basil and a squeeze of lemon, if desired.