It started as a stiff, cracker-like baked rice wafer — the soft, folded raw version tourists eat by the box today only became the norm after mass production took off in the 1960s and 70s.
Glutinous rice flour, sugar and cinnamon are worked into a dough, either baked thin and crisp into a curved cracker or left soft and folded raw ("nama yatsuhashi") around a dab of sweet red bean paste, sold stacked at stalls near Kyoto's temples and train station.
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