If you have a rice cooker, you can use the rice from it. If not and you don't want to clean two pots, just boil the rice in a saucepan and once ready, get it out and fry the canned tuna with some chopped onion and black pepper.
Going to Indonesia, you can find out that's a variety of their national dish (nasi goreng). A sunny side up egg on top of that is an extra bonus.