Cut the tofu into appropriate pieces.
Lightly season the tofu with a bit of salt.
Heat cooking oil in a pan and pan-fry the tofu until golden brown.
Mix soy sauce, red pepper flakes, minced garlic, sugar, and water to make the sauce.
Pour the sauce evenly over the fried tofu.
Simmer over medium-low heat until the sauce is reduced.
Finish by sprinkling green onion and sesame seeds on top.