Combine doenjang (soybean paste), soy sauce, gochujang (red chili paste), and minced garlic in a bowl and mix well.
Cut the tofu into 2 cm cubes.
Finely chop the green onion and onion.
Heat sesame oil in a pot and stir-fry the green onion and onion.
Add the tofu and stir-fry again.
Add the mixed sauce and pour in water.
Simmer over medium heat, then add sliced Cheongyang pepper (Korean spicy green chili).
Taste and adjust the seasoning with salt if needed.
Serve in a bowl to finish.