For the filling: Mix the pork, prawns, onion, ginger, soy sauce rice wine, cornstarch, sesame oil, salt, and pepper in a bowl. Stir to combine the ingredients.
For the dumplings: Take 1 wonton wrapper and place 2 teaspoons of the filling in the center. Then, gather up the sides of the wrapper and mold it around the filling into a ball-like shape, leaving the center exposed. Top each dumpling with a Goji berry, if using.
Oil the bottom of a bamboo steamer and line it with greaseproof or parchment paper. Arrange the dumplings in the steamer, cover with a lid and place it over a pan of boiling water, making sure the water does not touch the base of the steamer. Steam the dumplings for 6 to 8 minutes, or until cooked.
Meanwhile, combine the chile, and soy sauce into a bowl. Serve alongside the dumplings.
Ensure you pinch the wrapper around the filling firmly. To help, you can brush the wonton wrapper with egg wash to prevent wrappers from opening up and separating from the filling once cooked.