Finely chop the onion, green onion, and spicy green chili pepper.
Drain the oil from the canned tuna using a sieve.
In a bowl, mix doenjang (soybean paste), gochujang (red chili paste), minced garlic, and oligosaccharide syrup.
Add the chopped vegetables and tuna, then mix well.
Finish by adding sesame oil and sesame seeds.