Finely chop tofu, onion, green onion, and garlic.
Add cooking oil to a pan and stir-fry garlic and green onion to release aroma.
Add onion and stir-fry until it becomes translucent.
Add tofu and stir-fry, breaking it apart as you go.
Add gochujang (Korean chili paste), chili powder, soy sauce, and sugar, then stir-fry until the flavors are well absorbed.
Pour in 50ml of water and simmer over medium heat.
Finish with sesame oil and pepper, then serve over rice.