Combine ground beef, egg, chopped green onion, rice vinegar, soy sauce, oyster sauce, white pepper, and salt
Shape the mixture into small meatballs
Freeze the meatballs until firm
Dip a frozen meatball briefly in cold water
Roll it in glutinous rice flour until lightly coated
Repeat the dipping and coating process 6-7 times until the meatball is completely covered and the filling is no longer visible
Bring a pot of water to a boil
Cook the dumplings for about 18 minutes (adjust time based on filling type)
Test one dumpling to ensure the filling is fully cooked
Serve with your favorite broth or dipping sauce
