Hiroshima is very famous for their okonomiyaki! Back when the bomb was dropped their whole city was devastated. The bombs destroyed cities, families, and their food recourses. Okonomiyaki was easy to produce simply because it’s a thin batter pancake (more of a crepe) with cabbage,other veggies, meat, and or seafood. It’s easy to make with leftovers and what you have around. So it was a food that was easy to make with what little resources these people had. Hiroshima has honed this skill from their struggle and has turned it a craft.