Pour 150ml hot water over Sichuan peppercorns and let it cool.
Sprinkle 2 tsp salt over chopped Napa cabbage, mix, and let sit for 10 minutes.
In a large mixing bowl, combine ground pork, ginger, 1 tsp salt, sugar, white pepper, chicken bouillon, and cornstarch.
Add soy sauce and oyster sauce, mixing well.
Strain Sichuan peppercorn water and gradually mix it into the filling in three batches, ensuring full absorption before the next addition.
Stir the filling in one direction until it becomes sticky and cohesive.
Add neutral oil and sesame oil, mix until absorbed.
Gently squeeze excess water from Napa cabbage (do not over-squeeze) and mix it into the filling along with chopped green onion.