Wash the cabbage and slice it thinly.
Peel and devein the shrimp.
Drain the tuna and set aside.
Heat oil in a pan and stir-fry the shrimp.
When the shrimp is cooked, add the tuna and stir-fry together.
Add the cabbage and season with salt and pepper.
Place the stir-fried mixture over rice to complete the rice bowl.