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One of my earliest experiences with Japanese cart food was hearing a recording of someone half singing the words "yaki imo" (roasted sweet potato) as a man in a cart roamed my neighborhood. I'd have my husband run out and flag down the yaki imo man and he'd buy me a fresh, perfectly cooked over wood chips sweet potato. The experience of buying one of these potatoes right from the men themselves really can't be duplicated as they prepare them in a particular way and you can't get them nearly as fresh from stores that sell them from under heat lamps.
I'll miss getting a fresh, perfectly roasted sweet potato from the yaki imo men.