Start by making the filling.
Shred the cabbage finely and sprinkle with 2 tsp of the coarse salt and toss. Set aside for 5 minutes.
Mix the meat and remaining ingredients plus the leftover 1 tsp coarse salt in a medium bowl. Squeeze out the water from the shredded cabbage and add to meat mixture, mixing well. Set aside.
For the dough, mix the flour and boiling water until a soft dough forms. Turn out onto floured work surface and knead until smooth and elastic, about 5 minutes. Cut dough in half. Roll each half into a 12-inch roll. Cut 1/2-inch portions of dough from the roll. Roll each 1/2-inch portion into a 3-inch circle. Place about 1 tbs of filling in each circle. NOTE: I roll out ALL my dough circles before I begin to fill them. Process is cleaner and also more efficient.
Bring the edges of the circles up and seal very well, pinching to pleat slightly. This will form a crescent-shaped dumpling. They can be shaped other ways, but I find that to be a complete PAIN and the shape I make them in is the one the restaurants make them in.
Heat a large skillet over medium-high heat. Add about 1 tbs vegetable oil if using a regular pan, 1/2 tbs if using non stick. When oil is very hot, add the dumplings, pleated side up in the pan. Fry for about 3-5 minutes or until the bottoms are golden brown and start to crisp. Add 1/2 cup water, cover and reduce heat to medium, and steam until all water is absorbed; about 5-7 minutes.
These can be served with a dipping sauce made with 1 cup soy sauce, 1/2 tsp sesame oil and 2 tbs honey mixed together. Put these ingredients in a small saucepan and heat, stirring, until honey is dissolved.
Makes about 48 dumplings and they can be frozen and reheated.