Generally boil three open, turn off the heat, take out a dumpling open to see whether the inside filling has been melted, whether the outside skin has been cooked, you can determine whether to continue to cook or turn off the fire.

Put some cold water in a pot and bring it to a boil. Place the dumplings in the boiling water and cook. When the water boils again, add a spoonful of cold water and let it continue to cook. When the water boils again three times and the dumplings are floating on the surface, turn off the heat. This time the dumplings have been cooked, you can eat.