Cover the shiitake mushroom with warm water. Soak until turning tender throughout, 15 to 20 minutes. Remove and discard the stem. Finely mince the mushroom and transfer to a medium sized bowl.

Add the ground pork, ginger, scallion, oyster sauce and cornstarch into the bowl with mushroom. Mix in a circular motion until sticky.

Mix all the sauce ingredients together in a small bowl and side aside.

To slice tofu, cut the tofu horizontally across the block into two large even pieces, then further cut each piece into two even rectangles (so you get a total of 8 pieces). Use a paring knife to carve out a smaller rectangle in the center of the tofu, leaving about 1/4” (3mm) on the edges, so it’s easier to scoop out the tofu. (see the images above for reference) Use the back of a small spoon to scoop the center to form a dent for the filling. Pack filling into each tofu piece until it’s level with the tofu (*Footnote 1).

Add 1 tablespoon oil into a large nonstick skillet. Carefully transfer the tofu onto a spatula one piece at a time, filling side down, and slowly slide it into the skillet. Turn on medium-high heat. Sear the tofu until the meat has turned golden brown, 4 minutes or so. Check occasionally for pork doneness. Flip the tofu to brown the other side, 1 to 2 minutes, until slightly golden.

Move the tofu to one side of the pan. Add the remaining 1 tablespoon of oil, scallion, ginger and garlic to the other side. Stir a few times to release fragrance.

Stir the sauce again to dissolve the cornstarch completely. Pour it into the skillet. Stir the sauce between the gaps of the tofu pieces rapidly, and cook until the sauce has thickened. Transfer the tofu onto a serving plate, then pour the sauce over the tofu. Serve hot as a main dish.