Drain the oil from the canned tuna and prepare the tuna.
Finely chop the onion and bell pepper.
In a bowl, mix doenjang (soybean paste), gochujang (red chili paste), minced garlic, sesame oil, and a small amount of oligosaccharide syrup.
Add the tuna and chopped vegetables to the seasoning sauce and mix well.
Wrap the finished tuna ssamjang with leafy vegetables (lettuce, perilla leaves, etc.) and enjoy.