Wash the cabbage thoroughly and shred it.
Julienne the carrot.
Thinly slice the onion.
Heat frying oil in a pan and lightly sauté the cabbage, carrot, and onion.
Place the rice in a bowl.
Top the rice with the sautéed vegetables and tuna.
Add gochujang, sesame oil, and seaweed flakes.
Mix everything evenly and serve.