2. Generally, the meat stuffing with normal size can be steamed in jiaozi 15 minutes. If it is a thick frozen jiaozi, it needs to be steamed for 20 minutes; However, the normal size vegetarian jiaozi steamed for 10 minute, while the larger vegetarian jiaozi steamed for 15 minute. Note, however, that the steamed frozen jiaozi must be steamed in cold water, which is different from the boiled water steamed in fresh jiaozi. Because the frozen jiaozi needs to be thawed slowly in the process of steaming, if the frozen jiaozi is directly steamed in boiling water, it will easily lead to ripe skin and immature stuffing, or steamed stuffing but rotten skin.