You can’t throw pierogi straight from the freezer into boiling water. Frozen pierogi are dry and inelastic, so they will immediately burst and stick together in boiling water .
If you’ve already placed the dumplings in boiling water, add a glass of cold water to the pot. This will even out the temperature and ensure the dumplings retain their shape and don’t fall apart.
You can bring the dumplings to room temperature by soaking them in room-temperature water for a few minutes. This will help increase the pliability of the dough and prevent them from cracking during cooking.
