Combine the ground beef with the cabbage, ginger, green onions and garlic in a bowl, mixing them together with your hands. Mix the sesame oil with the salt, pepper and soy sauce in another bowl, then combine the 2 mixtures.
Add about a tablespoon of the beef mixture to the center of a wonton wrapper. Dip your fingertip in some water and trace the half-edge of the wonton wrapper, then fold it in half and crimp the edges closed with your fingers. Don’t put too much filling in, else the wontons will burst open!
Steam the wontons for about 8 minutes or until the filling is cooked through. If you freeze them you will need to steam them for about 13 minutes.