Remove the oil from the canned tuna.
Finely chop the green onion, chili pepper, and garlic.
In a bowl, mix tuna, Doenjang (soybean paste), Gochujang (red chili paste), minced garlic, chopped green onion, chili powder, sesame seeds, and sesame oil.
Serve the prepared tuna ssamjang on lettuce or leafy vegetables and enjoy.