Takoyaki(octopus dumpling) is local fast food especially popular in western Japan.
It is roasted flour cake balls with octopus meat inside, served usually with Worcester sauce, mayonnaise, dried bonito shavings and dried sea weed powder.
Most Takoyaki places are pap-mom shops, but there are some exceptions.
The photo below is a shop of Tsukiji Gindako, one of leading Takoyaki chain restaurants.
You can see their kitchen from the street.
This must be something new and fun for foreigners.