Prepare brown tofu by cutting off the top part and then remove the filling

In a medium-sized bowl, mix all the ingredients for the filling and stir until well combined. To ensure the taste is right, you can test it by frying a small amount of the mixture. If needed, adjust the seasoning by adding more salt, black pepper or chicken powder. 

Gradually fill the tofu with the meat mixture until the surface is full. Repeat this step until all the tofu is filled. 

Heat oil in a pan, then flip the tofu so that the meat filling is on the bottom. Fry until the meat is golden brown, then flip and cook until the entire surface is cooked and firm. Remove and set aside. 

Heat the oil in the pan again, then add water and the ingredients to make the sauce. add tofu meatball,  Stir and cook for a while 

Add the cornstarch mixture and stir briefly. Finally, add the sliced green onions. 

Tofu meatball in oyster sauce soup is ready to be served!