Combine the filling ingredients starting with the ground pork and the seasonings (soy sauce, shao xing wine, sesame oil, and corn starch). Try to mix in one direction until the filling takes on a smoother, paste-like quality (if the meat was very cold, this will take a little bit longer). Once it’s ready, add the napa cabbage, green onions, and ginger and mix until well incorporated.
Place ~1 tablespoon of filling into the center of each wrapper. Try not to get any filling mixture onto the edges as that will diminish the strength of the seal later on. Dab your finger in some water and wet the inside edge of the top half of the wrapper. Fold the bottom half edge (dry) toward the top half edge (wet) and press together firmly to create a half moon type shape. Bonus points for pleats: add 2-3 small folds going in the same direction on the top half edge (wet) before bringing the sides together. This will give the dumpling it’s signature rounded look. This amount of filling is enough for 30-40 dumplings, depending on how much you’re able to stuff into each one. I recommend under-filling for beginners to ensure each dumpling is sealed properly.
Bring a large pot filled 3/4 of the way with water to a rolling boil. Drop the dumplings in (max 15-20 at a time) and immediately give it one comprehensive stir to prevent sticking to the bottom of the pot / each other. Once the dumplings float, cook for 2 additional minutes and then fish them out and enjoy with a dipping sauce or in some hot & sour soup (pictured).