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- Saw off the top small section of the coconut and keep as a lid. Drain the coconut water and rinse the inside. Do not remove the flesh. Stand the coconut on a bowl and fill the bowl to cover half the coconut. (This helps to prevent the coconut from cracking during steaming.)
- Bring water to a boil. Add in gingko nuts, white fungus, red dates, rock sugar and longan flesh. Simmer for 8-10 minutes, then pour contents into the coconut.
- Place the bowl with the coconut onto a steamer and steam over gently boiling water for 22 ½ hours.
- Remove and serve the sweet soup hot.