Try this recipe and never buy a dumpling in your life again. No joke.
Roll the dough into a long even rope. Cut into short coins. Use a Chinese-style rolling pin to roll each piece into a small, thin circular wrapper. Fill the wrappers with the meat filling.
Bring a pot of water to boil. Add just enough dumplings so they don’t crowd together. When the water starts to boil again, add 1/4 cup cold water to cool down the water. When the water starts to boil again, repeat adding the cold water. Do this 3 times, and then fish out the dumplings. Serve with black vinegar, chili oil, and soy sauce to taste. Top with some cilantro.