One evening, walking towards Ningyocho, we heard the cry “Yaki Imo, Yaki Imo, Yaki Imo” and after a couple of blocks happened across this guy selling baked sweet potatoes from a wood burning oven on the back of his van. I do hope it was nowhere near the fuel tank. We heard him later on as he passed the izakaya we were in. A wonderful sight, sound and smell.