And as another reason, the shops that were originally food stalls make the customers eat it on the iron plate so it was not necessary for the shops to wash dishes because traditionally the shops had cut down the water used for washing the dishes.
また、屋台発祥の店では、屋台営業時の名残で皿をわざわざ洗うための水を節約するため、鉄板で食べさせて、洗い物を無くすという理由もある。