Finely chop tofu, vegetables, onion, and green onion.
Drain the oil from the tuna using a strainer.
Stir-fry the chopped onion and green onion in a heated pan.
Add tuna and tofu, and stir-fry together.
Add gochujang (Korean chili paste), doenjang (soybean paste), and minced garlic, and mix well.
Finish by adding sesame seeds, Cheongyang chili pepper, and black pepper.