Carefully wash and dry the basil and spinach. Chop the basil, spinach and garlic finely.
In a food processor or blender add the basil, spinach, avocado, garlic, olive oil, sunflower seeds, lemon juice, salt and pepper. Pulse the mixture a few times. You can decide whether you want your pest to be a traditional chunky texture or a smooth texture.
Finally, grate the parmesan and stir it into the pesto until well combined. Enjoy!