In a large bowl, mix napa cabbage and salt. Let it rest for 15 minutes. Use a clean dish towel or cheesecloth to squeeze out extra water.
Combine the squeezed cabbage with other filling ingredients in a large bowl. Mix thoroughly.
Assembling
To assemble, put a spoonful of filling in the center of the dumpling wrapper. Dip your finger in water and run it along the edge of the wrapper.
Fold the wrapper in half, creating a half-moon shape. Press the edges to seal.
Starting from one end, pinch and fold small pleats along the sealed edge, pressing to secure.
Dumpling Sauce
Heat oil in a small pot until shimmering. Add garlic and scallion whites and cook for 15 seconds.
Remove pot from the heat, and add the remaining ingredients. Transfer to a small bowl for serving.
Frying Dumplings
Pour ½ cup of cornstarch onto a large plate, and place the dumplings on the plate, bottom-side down.
Heat 2 tablespoons of oil in a non-stick pan over medium-high heat. Shake the excess cornstarch off the dumplings, place them in the pan, and cook for 2 minutes until the bottoms are golden brown.
Add ½ cup of water, cover, and reduce heat to medium. Simmer until the water evaporates. Uncover, increase heat to medium-high, and fry until the dumplings' bottoms are golden brown and crisp.
Serve with dumpling sauce. Enjoy!
Notes
Storing: Store fried dumplings in an air-tight container in the refrigerator for up to 3 days. The dumpling sauce can be stored similarly for up to one week.Freezing: Dumplings freeze incredibly well. When stored properly, they can last for up to 6 months! Once you've wrapped the dumplings, place them on a floured baking sheet, with some space between each one. Freeze for 2 hours until they're semi-solid, and then transfer them to a ziplock bag for long-term storage.