Marinade fish and tofu: soy sauce and ground pepper. Marinade for about 15 minutes.
In a pan, pour oil and heat up over medium heat. Fry the tofu, occasionally turning over on each side until the color turns brown. Transfer into a paper lined plate and drain excess oil. Cut into thin rectangular square. Set aside.
In the same pan, fry the marinated milkfish. Continue cooking until both sides are golden brown. Transfer on a paper towel lined platter. Set aside.
In a clean sauce pot, sauté the onions, garlic and ginger. Add in tomatoes and continue to cook until the tomatoes are soft. Add the fermented black beans and chili. Saute for 2 to 3 minutes.
Pour water and add in the oyster sauce and brown sugar. Season with salt and crushed pepper. Adjust heat to low and simmer for additional 2 minutes. Season with five-spice powder. Stir well to combine.
Pour in the dissolved cornstarch and continue to simmer until the sauce thickens.
Gently add the fried fish and tofu cubes. Simmer for another 2 minutes. Gently mix until the fish is covered with tausi sauce. Remove from heat and garnish with chopped wansoy.
Serve and enjoy! Happy cooking!