Cut the tofu into bite-sized pieces.
Finely chop onion, chili peppers, and scallions.
Add cooking oil to a pan and sauté the onion and chili peppers.
Add doenjang (Korean soybean paste), gochujang (Korean chili paste), and minced garlic and stir-fry together.
Pour in water and add the tofu, then bring to a boil.
Add scallions and boil once more.
Transfer the finished tofu doenjang stew to a bowl.