1.Preheat Oven To 350 Degrees F (175 Degrees C). 2.In A Medium Saucepan, Mix Water, Garlic, Onion, Salt And Black Pepper. Cover And Bring To A Boil. Let Boil For 1 Minute, Then Stir In The Rice. Cover And Remove From Heat. Let Stand For 5 Minutes. 3.Line The Bottom Of A 9X5 Inch Loaf Pan With Half Of The Rice. Top With Drained Tuna, Cheese, Tomatoes And The Remaining Rice. 4.Bake In A Preheated Oven For 20 Minutes.