"It takes about 10- 15 minutes to quickly freeze the wrapped jiaozi at low temperature, so when the frozen jiaozi is taken out, it is as hard as a stone. Therefore, this kind of quick-frozen jiaozi takes longer to cook than the jiaozi, which takes about 10- 15 minutes. So when you cook frozen jiaozi, you can't cook fresh jiaozi at the same time. You must be patient until jiaozi is ready. "