It was originally a one-cent western dish ?! A staple food of stalls.
Okonomiyaki is made by mixing ground nagaimo, cabbage, and various ingredients of meat or seafood of your choice into a batter made of flour and water, then grilling on an iron griddle. Spread sweetish sauce, and sprinkle katsuobushi, aonori, and mayonnaise on top. The origin is unknown, but it was a staple dish of stalls in the prewar period called "western style grill." It was sold for one sen, so also called "1 sen western dish." Since the price of meat rose after the war, seafood was used more often for Okonomiyaki, but it has always been one of the staple dishes everybody loves, and it is a food that represents Osaka.