Combine all ingredients (except cilantro stems, chives, and wrappers) in a large bowl, then stir in cilantro stems and chives. Set bowl in a larger bowl of ice to keep chilled while forming dumplings. Place a slightly rounded teaspoon of filling in the center of a wrapper and moisten the area around the filling with water. Fold in half to form a crescent and press to seal. Moisten one corner and bring corners together, pressing them, to form a tortellini-shaped dumpling. Repeat with the remaining filling and wrappers. Cook dumplings in a large pot of gently simmering water until pork is just cooked, about 3 minutes. Transfer with a slotted spoon to a platter.