Okonomiyaki(savory pancake with whatever you like in it) is a famous snack food which you can make quite easily. Basically you just mix batter with veggies, meat or seafood of your choice and fry on the not plate. You can even put cheese and mochi (rice cake) in it.
We encountered the best Okonomiyaki when we visited Osaka.That is called Negiyaki(savory spring onion pancake).
They look alike but Negiyaki has such a smooth taste and melts in your mouth.