Place tofu in a bowl and cover with boiling water. Let sit for 1 minute; drain.
Mix water and cornstarch together in a bowl to make a runny paste.
Heat oil in a wok or large skillet over medium heat. Cook and stir spring onions, ginger, peppercorns, and garlic until fragrant, about 1 minute. Stir in ground pork, doubanjiang paste, rice wine, and soy sauce; cook, stirring frequently, until pork is browned, about 5 minutes.
Stir drained tofu into the wok or skillet. Cook and stir until coated with sauce, about 2 minutes. Season with salt. Pour in cornstarch paste and mix well until sauce thickens, about 1 minute.