Heat oil in a large pot. Add onions, ginger and celery. Saute until fragrant. Add zucchini and celery and sauté for one minute. Add lime leaf flakes, coconut sugar and galangal powder if using. Add 2 cups water and bring to a boil. Then cover and lower to a simmer. Let simmer for 10 minutes or until veg is tender. Add broccoli and greens. Turn off heat and cover for 5 minutes. Let cool and transfer to blender, blend in batches. Pour back into pot and add coconut milk, stir and season w salt and pepper. Serve w cilantro and a drizzle of coconut milk.