1. Add the avocado oil to a large pot over medium to high heat. Once hot, add onion and sauté for about three minutes. Add celery and carrots and sauté for another five minutes. Add garlic and broccoli and sauté for another five minutes.
2. Add 5 cups water, then salt, and pepper. Stir and bring mixture to a boil. Once boiling, reduce heat to low and simmer, covered, for 5 minutes.
3. Once ready, remove from heat and let it cool down.
4. Using a high-speed blender add the soup mixture to the blender along with the soaked cashew, nutritional yeast, salt, and pepper (you might have to this this in 2 batches, depending on the size of you blender).
5. Blend until very smooth and creamy.
6. Season to taste with additional salt and pepper if desired. You may also thin out the soup by adding more water (¼ of a cup at a time).
7. Transfer the soup back into the pot, reheat, and serve with chopped parsley and sesame seeds. Enjoy!