Bring water to boil, cook sago for 5 minutes. Cover for a while and rinse under running water.
Cook fresh gordon euryale for 15 minutes and lily bulb for 5 minutes alternatively. Take out and set aside.
Bring water and rock sugar to boil. Set aside.
Dice half mango, blend the other half water syrup.
Combine all ingredients and chill.
Add in mango dices and pomelo flesh and serve.