Warm up the rice.
Stir-fry cabbage in tuna oil.
When slightly golden, add tuna and stir-fry together.
Add soy sauce and tuna sauce to one side of the pan and simmer briefly, then mix together.
Add pepper and rice, stir-fry everything together and transfer to a bowl.
On low heat, scramble only the egg whites in a pan and place on top of rice.
Drizzle with sesame oil.