Just stuff a tomato with tuna and grill in a toaster oven! No need to add anything else!
This one is a very simple recipe, with canned tuna just stuffed into a tomato. Although it's quite easy, it's still a very tasty and elegant dish.
If you take a small slice off the bottom of the tomato, it will sit a lot better. Add any other vegetables of your choice!
Enjoy Japanese food around the world.