Measure out the rice and water/chicken broth as normal.
Remove the stem and exposed core from the tomato.
Bring the cooking liquid to a simmer and add the rice, salt, black pepper, smashed garlic, and butter.
Place the whole tomato in the center of the pot, cover with a lid, and simmer on low for about 20 minutes.
Once cooked, mash the tomato with a spoon to release its juices and mix it into the rice.
Finish the dish with chopped green onion.