Prepare the marinade: Combine red fermented bean curd, sugar, oyster sauce, and white pepper in a bowl. Crush the bean curd and mix everything together.
Marinate the pork: Slice the pork belly into 1/2 inch thick slices and add them to the marinade, mixing to ensure each piece is well coated.
Prepare the batter: Combine cornstarch, flour, baking powder, and water in a separate bowl. Stir until there are no clumps.
Heat the oil: Heat oil in a wok to 350°F (177°C).
Fry the green beans: Add the green beans to the hot oil and fry for just a minute, then remove and set aside.
Fry the pork: Mix the batter with the marinated pork. Fry the pork in batches in the hot oil for 2 minutes, then remove.
Second fry: Increase the oil temperature to 375°F (190°C). Add the pork back in for a second fry, this time for just 30 seconds, then remove.
Serve: Plate the pork with the green beans and serve immediately.