In a large bowl, using your hands or a spoon mix pork, egg, white scallions parts,
garlic, broth, soy sauce, ginger, fish sauce (if using), and sesame oil.
Line a small baking sheet with parchment paper. Lightly dust with flour.
Place dumpling wrappers on a clean surface. Place a heaping tsp of pork filling
just below center on each wrapper.
Wet the edge of wrapper with water. Fold top half over bottom half and pinch borders to seal.
In a Medium skillet over medium heat add 1 Tbsp of vegetable oil. Add dumplings in an even layer. (Touching is ok!)
Fry until underside is golden brown, 1 to 2 minutes.
Add 1/3 cup water to skillet, reduce heat to medium-low, and cover with a tight-fitting lid. Let steam 3 minutes,
then adjust lid so it is ajar, allowing steam to escape. Cook until no water remains, about 3 minutes more.
Transfer dumplings to a platter and repeat with remaining dumplings.
Dipping Sauce
In a medium bowl, combine soy sauce, vinegar, and green scallion parts.