Combine soy sauce, rice vinegar, 1 tablespoon chives, sesame seeds, and chilli-garlic sauce in a small bowl. Set aside.
Mix pork, minced garlic, egg, 2 tablespoons chives, soy sauce, sesame oil, and ginger in a large bowl until thoroughly combined.
Place a dumpling wrapper on a lightly floured work surface and spoon about 1 tablespoon of the filling in the middle. Wet the edge with a little water and crimp together forming small pleats to seal the dumpling. Repeat with remaining dumpling wrappers and filling.
Heat 1 to 2 tablespoons vegetable oil in a large skillet over medium-high heat. Place 8 to 10 dumplings in the pan and cook until browned, about 2 minutes per side. Pour in 1 cup of water, cover and cook until the dumplings are tender and the pork is cooked through (about 5 minutes).
Repeat for remaining dumplings. Serve with soy sauce mixture for dipping.