Add the pork, shrimp, green onions, ginger, and garlic to a mixing bowl and mix well.
Next, add in the soy sauce, mirin, chicken stock, cornstarch, salt, and pepper and mix thoroughly.
Get a small bowl of water to wet the edges of the wontons. Lay out a wonton on a cutting board. Add about 1-2 teaspoons of the mixture to the center of the wonton.
Dip your finger in the bowl of water and wet the edges of the wonton wrap just enough to make it wet.
Fold the wonton in half and gently press the edges together to seal.
Take the 2 folded tips and place one on top of the other, being careful not to squeeze out the filling. Repeat this process for the rest of the filling.
Bring water to a gentle boil in a pot or wok. Line the steamer or steaming baskets with parchment paper. Working in batches, steam the wonton for 5-7 minutes.
Serve with Chinese hot chili oil or dipping sauce (recipe below).
Mix the soy sauce and mirin in a small bowl.