If the gyoza are freshly wrapped, they are usually put down after the water boils. At this point, the water temperature will no longer fluctuate due to the addition of the dumplings. During the heating process, you can pour in a moderate amount of cold water to continue heating. after 5-8 minutes, the dumplings will expand and float on the surface of the water. At this time, the dumplings are almost cooked.
For pre-wrapped frozen dumplings, the time can be a little longer, about 10 minutes. The exact time depends on the type and size of the dumplings and the heat of the stove.