Cut the tofu into thick slices.
Remove moisture from the tofu using a paper towel.
Add cooking oil to a pan.
Grill the tofu on medium-low heat until golden brown on both sides.
Place the grilled tofu on a plate.
Mix soy sauce, cooking wine, and sugar to make a sauce.
Bring the sauce to a boil in the pan and pour it over the tofu.
Finish by topping with katsuobushi flakes.