First of all, if the jiaozi you bought is fresh, you can soak it in cold water directly for a period of time, or soak it in cold water several times to change the water, so as to keep it fresh and prevent deterioration. Note that this method is suitable for jiaozi, which will be used in a few hours.
Secondly, if you buy frozen jiaozi, the best way is to thaw it first, and then treat it like fresh jiaozi. But if you don't have time to wait for it to thaw, you can just cook it in boiling water, so that you can make delicious jiaozi. However, it should be noted that this method will make the texture of jiaozi softer and slightly change its taste.
In addition, you can also dry the bought jiaozi and put it in a dry and ventilated place, which can prolong the shelf life. If it is to be stored for a long time, it is recommended to seal it with a sealed bag or a fresh-keeping box, which can extend the shelf life.
In short, although there is no refrigerator, as long as you choose the right method and store it properly, you can ensure the freshness and delicacy of jiaozi and let you enjoy the delicious food to your heart's content.