In Taiwan, these are called meat pies.The filling is made up of just ground beef and onions. They're simply seasoned with soy sauce and black pepper.
After making the daikon radish pies Recipe ID: 1099359, I made another version with beef.
Be sure to use chopsticks when mixing with the hot water.If you add katakuriko to the filling, the meat won't dry out.
Enjoy Japanese food around the world.