Japan — kamado tradition from ancient period; Toshiba suihanki invention, 1955 (Tokyo); IH pressure cooker development, 1980s–present
The cooking of Japanese short-grain rice — considered one of the most technically demanding yet fundamental skills in Japanese cooking — has been mediated by three successive vessel traditions that each create distinctly different results: the kamado (traditional wood-fired earthen stove with a heavy cast-iron pot), the donabe (clay pot over gas burner, as discussed separately), and the suihanki (electric rice cooker — the device that transformed domestic Japanese life after its invention in 1955 by Toshiba). The kamado tradition, technically best-described by the old aphorism 'hajime choro-choro, naka pa-pa, akago naite mo futa toruna' ('start with a trickle, then vigorous heat, and don't lift the lid even if the baby cries'), produces rice with maximum starch gelatinisation and the characteristic okoge (scorched rice crust at the bottom) that is considered a delicacy. This five-phase cooking arc (initial gentle heat, vigorous steam, reduced heat, rest, absorption) is the template from which all rice cooker engineering derives. The suihanki (electric rice cooker) invented by Toshiba's Yoshitada Minami in 1955 democratised perfect rice cooking — the bimetal thermostat mechanism he developed automatically cut power when the water was absorbed and temperature rose above 100°C. Modern IH pressure rice cookers (induction heating, operating above atmospheric pressure at 110–120°C) replicate the kamado's high-pressure steam phase more accurately, producing rice with superior sweetness and texture. The controversy among Japanese rice obsessives between donabe, traditional kamado, and premium IH cookers is genuinely technical and ongoing.
The vessel does not add flavour directly — it determines the sweetness and texture of the rice: kamado and pressure IH produce maximum starch sweetness; basic electric produces adequate but simpler results
{"The hajime choro-choro sequence encodes the five-phase kamado technique: low start, high steam, steam-carry, rest, absorption — all modern rice cookers replicate this arc","Never lift the lid during cooking — steam pressure is critical to gelatinisation and releasing it causes uneven cooking","Water ratio is variable by rice variety, age, and washing degree — new rice (shinmai) absorbs less water than older rice","Soaking washed rice before cooking (30 minutes minimum) enables more even water absorption and faster starch gelatinisation","Okoge (scorched bottom crust) is a desired by-product of high-heat kamado and donabe cooking — adding textural and flavour contrast"}
{"The Zojirushi NW-JEC18 (pressure IH rice cooker) is considered among the finest production-level rice cookers — it runs a multi-phase programme replicating kamado timing","Kamado rice cooking with hinoki (Japanese cypress) wooden lid creates a resinous aromatic quality impossible to replicate in metal or ceramic","For donabe rice cooking, the dual-lid design of Nagatani-en's Kamado-san creates the steam pressure that substitutes for kamado's weight","Okoge can be intentionally created in a donabe by extending the high-heat phase 30–60 seconds after the timer — the slightly scorched crust is eaten with green tea (ochazuke-style)","Rice washing: the first wash water is discarded immediately (bran water absorbs quickly); subsequent washes should run clear before soaking"}
{"Lifting the lid during cooking — even briefly releases essential steam and causes uneven gelatinisation","Not soaking rice before cooking — particularly for kamado and donabe methods where timing is less forgiving than electric cookers","Using incorrect water ratio for rice age — shinmai (new harvest) needs less water than rice stored 6+ months","Not resting rice after cooking — the steam-rest phase (5–10 minutes off heat) allows final moisture distribution"}
Tsuji, S. (1980). Japanese Cooking: A Simple Art. Kodansha. (Chapter on Rice and Noodles.)