GYUUDON is good (marinated, thin sliced beef over rice), and KATSUDON is pretty well-liked too (battered, deep-fried porkchop, then pan fried covered with an egg beaten with soy sauce, sugar, and green onion. Served on rice). You can buy instant YAKISOBA - (pan fried noodles), and it's pretty good. YAKITORI (marinated chicken kabobs) are popular, and you can't go wrong with RAMEN (the real stuff, not the kind in a plastic bag or styrophone cup). Cold SOBA noodles(buckwheat noodles dipped in a sauce made from soysauce, wasabi, green onion and diluted to taste with water) are great in the summer. Everybody loves TEMPURA (various deep-fried vegetables, but also often shrimp as well. The batter is just tempura flour and water mixed together). It is also often eaten with the soba.
6th year living in Japan