Drain the oil from the tuna using a strainer.
Finely chop the green onion, onion, and Cheongyang chili pepper.
In a bowl, combine the tuna, doenjang (soybean paste), gochujang (red chili paste), minced garlic, and the chopped vegetables.
Add sesame oil and toasted sesame seeds, then mix evenly.
Serve with lettuce or other leafy vegetables for wraps.