Start by draining the tofu and pressing it to remove excess moisture. Wrap it in a clean kitchen towel and place a heavy object on top for about 15-20 minutes.
Once pressed, cut the tofu into bite-sized cubes.
In a frying pan or wok, heat 1 tablespoon of oil over medium-high heat.
Add the tofu cubes to the pan and fry until they are golden brown and crispy on all sides, about 8-10 minutes.
In a small bowl, whisk together the soy sauce, sugar, minced garlic, Korean red chili powder, and water.
Once the tofu is crispy, pour the sauce over the tofu in the pan and let it simmer for 2-3 minutes until the sauce thickens slightly.
Drizzle the sesame oil over the tofu and give it a final stir.
Transfer the Spicy Korean Tofu to a serving plate. Garnish with chopped green onions and sprinkle with white sesame seeds.