First, make the sauce. In a medium bowl, mix together: water, cornstarch, hoisin sauce, soy sauce, sake or shaoxing wine (or chicken broth), and sesame oil. Set aside
In a large sauce pan over medium high heat, add some oil. Then add the minced garlic and ginger. Stir fry for a minute.
Add the green onions and cook for 30 seconds.
Then add ground pork and cook until the pork is browned.
Add the doubanjiang (spicy chili bean paste). Stir to mix.
Add the cubed tofu. Gently mix.
Pour in the bowl of sauce (prepared in Step 1) and mix to combine. Mix well but gently so that you don't break the tofu cubes too much.
Keep cooking until the sauce reduces and becomes thicker. Then remove from heat. Eat hot and enjoy! Best with a big bowl of rice.