Tips
1. Simmer until duck soft, otherwise, the duck would be chewy and hard to eat.
2. After simmering, uncover and continue to boil for 3-5 minutes. It makes soup thicken and enhance flavor.
3. Carefully fry crystal sugar over low heat because it is easy yo be burnt and has a bad smell.
4. Enjoy duck meat first. Then add a little soup stock, bring to a boil and cook other hot pot ingredients.