Umm... everything? (^ ^
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If I take the best of the best, it would be:
UNAGI~
SUSHI~ (especially chuutoro! a perfect balance!!!!!!!!!)
YAKIJAKE~ (grilled salmon w/ salt or soy sauce... a classic.)
ZAKKOKUMAI~ (rice mixed with lots of grain and other crops)
RAMEN~ (who doesn't know, duh. god of noodles.)
NASHI~ (the awesome fruit!)
CHEESE-AGE (I think it's an original recipe that my grandma made, it's cheese put between two hanpen (idk, it's like kamaboko but fluffier.) and grilled in oil like tenpura and eaten with soy sauce. 最高!)
I've got too many already and I'm probably not half done (^ ^