Japan (mochigome cultivation — nationwide; joshinko and mochiko production — nationwide mill tradition)
Japan's rice flour tradition encompasses two primary types with distinct properties and applications: joshinko (上新粉, refined regular rice flour from non-glutinous japonica rice) and mochiko (もち粉 / 白玉粉, glutinous rice flour / sweet rice flour). The distinction is fundamental — regular rice flour (joshinko) produces firm, slightly chewy preparations that do not become sticky with heating; it is used for higashi (dry wagashi), rice crackers (senbei and osenbei when properly dried and baked), and some traditional confections. Mochiko/shiratamako (glutinous rice flour, from mochigome) contains primarily amylopectin starch with negligible amylose, producing preparations with a characteristic sticky, elastic, chewy texture that is the defining quality of mochi, daifuku, shiratama dango (soft white balls for dessert soups), and wagashi. Shiratamako (白玉粉) is a premium washed and dried form of mochiko with superior texture for dango preparation; the difference is whether the starch is extracted by washing (shiratamako — finer texture) or simply ground (mochiko — coarser, less expensive). For chewy, bouncy preparations: mochiko or shiratamako. For firmer, more rice-tasting confections: joshinko. Tempura flour (ko-mugi-ko tenpura) adds rice flour to all-purpose wheat flour for a crisper, drier coating.
Joshinko: clean, neutral rice flavour with firm bite; mochiko/shiratamako: subtle, neutral sweetness with elastic, chewy, sticky character — pure textural experience
{"Joshinko: non-glutinous japonica rice, firm texture, less sticky — senbei, higashi, firm wagashi","Mochiko/shiratamako: glutinous rice, amylopectin-dominant, elastic and sticky — mochi, daifuku, dango","Shiratamako = washed mochiko: finer particle size produces smoother dango and mochi texture","Rice flour addition to tempura batter (20–30% ratio): reduces gluten formation for crispier coating","Water temperature matters: cold water for shiratama dango (slows over-development); room temp for joshinko preparations"}
{"Shiratama dango doneness test: drop into simmering water; cooked dango float to surface; cook 30 more seconds","For smoother mochi: use microwave method (mochiko + water mixed, microwave 2 minutes, stir, repeat) for small batches","Rice flour addition to okonomiyaki batter: replaces 20% wheat flour for crisper, lighter result","Warabi mochi uses kuzu arrowroot starch not rice flour — completely different starch despite similar appearance"}
{"Using joshinko where mochiko is required — produces firm, non-chewy confection without the expected mochi texture","Over-kneading glutinous rice dough — develops too much elasticity; mochi becomes difficult to shape","Substituting Western glutinous rice flour brands for Japanese mochiko — starch origin differences affect texture","Not cooking shiratama dango through completely — raw centres have unpleasant grainy texture; float then cook 30 more seconds"}
Japanese Sweets — Mineko Takagi; Japanese Cooking: A Simple Art — Shizuo Tsuji