Throw the oil, edamame, spinach, lemon juice, tahini, onion, garlic, cumin, pepper flakes, and salt into your high-speed blender or food processor and blend on high or process for about2 minutes, until smooth and creamy. Stop the machine periodically and scrape down the sides of the container to fully incorporate the ingredients. A food processor will give the mixture a coarse consistency, which some people prefer.Tweak flavors to taste. (You may like more lemon juice, garlic, pepper flakes, or salt.)Serve topped with the sesame seeds and parsley.