Finely chop the tuna.
Finely chop Cheongyang peppers, onion, and green onion.
Put the measured tuna, chopped vegetables, gochujang, doenjang, minced garlic, sesame seeds, and sesame oil into a bowl and mix well.
Heat some oil in a pan, then stir-fry the ssamjang over medium-low heat for 2–3 minutes.
Transfer the finished tuna ssamjang to a bowl.