ok, I didn't vote because I couldn't pick just one thing I love. Food is one thing that keeps me spending time in japan. luckily there is lots of good japanese food in australia too. Ok so I like (in no particular order).
ramen (love miso ramen in japanese winter)
gyoza
sushi and sashimi (love salmon or tuna sashima when fresh, I get awesome sashimi in sydney, maybe even better than what I've had in japan).
tonkatsu karee (I love coco ichi. best curry. and they will make it damn hot if you can handle it)
crab karoke (crab croquets)
takoyaki
hiroshima style okonomiyaki (i got of the shinkansen once in hiroshima just to go to okono-mura because I love hiroshima style okonomiyaki. yes it was worth it!)
shabu-shabu (good to sit and eat a lot and get drunk)
yakiniku (love it too. good to get in some kimchi and lots of different beef)
yakitori (another strong favourite - sadly this is one type of japanese food is not common back home, well not the real japanese style and variety)
tempura (love prawn tempura. who doesn't)
mcdonalds teriyaki burger and ebi-filet-o (mmmm tasty)
MOS burger (like the name says: japanese fine burger)
pocky (i know it's a snack)
tonkatsu sandwhiches from mitsukoshi. so expensive but damn good!
japanese strawberries (best in the world)
green tea ice cream
fugu (tasty if it doesn't kill you!)
udon (a good change from my fav ramen noodle)
rice snacks of all types - love them
wasabi flavour chips/crisps - love them
teriyaki flavour chips/crisps are ok when drunk
I also love japanese beer. favourites are: suntory malts (and premium malts), kirin brau meister, ebisu, sapporo, asahi
I'm sure there is more, but that's all I could think of off the top of my head.

if you can't tell, I LOVE japanese food.
nihon-ryori oishii katta desu yo.