Wash the lettuce thoroughly and cut into bite-sized pieces.
Julienne the carrot and cucumber.
Place rice in a bowl.
Top the rice with lettuce, carrot, cucumber, and seaweed flakes.
Drain the oil from the canned tuna and place the tuna on top of the rice.
Add gochujang (Korean chili paste), sesame oil, and sesame seeds.
Mix all the ingredients evenly.