Mochi (Japanese rice cake) is so essential to locals’ lives that even the drugstores sell it. But for the freshest and widest variety, go straight to the source: Nisshodo, an almost century-old business. Choose among pink-and-white chichi dango (or milk mochi), mochi filled with smooth azuki bean, monaka (delicate rice wafers sandwiching sweetened lima-bean paste), and much more.