Rehydrate dried shiitake mushrooms (if using) in warm water for 20 minutes. Squeeze dry and finely dice.
Rinse the preserved mustard greens thoroughly to remove excess salt. Squeeze dry and finely chop. If using salty preserved greens, you may need to soak them for 15-30 minutes before rinsing.
In a large bowl, combine the ground pork, chopped preserved mustard greens, diced water chestnuts (if using), and diced shiitake mushrooms (if using).
Add soy sauce, oyster sauce, sesame oil, white pepper, cornstarch, and sugar to the pork mixture.
Mix thoroughly by hand or with a spoon, pounding the mixture against the bowl for 3-5 minutes until it becomes sticky and well combined. This helps create a tender texture.
Flatten the mixture into an even patty on a heatproof plate. Make a slight indentation in the center to help it cook evenly.
Bring a pot of water to a rolling boil in a steamer.
Place the plate with the pork patty into the steamer. Cover and steam for 15-20 minutes, or until the pork is cooked through and the juices run clear. The cooking time may vary depending on the thickness of the patty.
Carefully remove the plate from the steamer. Drizzle with sesame oil or soy sauce if desired, and garnish with chopped green onions before serving immediately with steamed rice.
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