Japan-wide — rice cultivation introduced from China/Korea circa 300 BCE; Koshihikari developed in Niigata 1956
Kome (米, Japanese rice) is the foundation of Japanese civilisation — the crop that shaped Japan's settlement patterns, social organisation, ceremonial calendar, and cuisine. The standard eating rice is japonica (uruchi-mai), short-grain, high-amylopectin (sticky when cooked) — fundamentally different from long-grain indica rice used in most of the world. Within Japanese uruchi-mai, major cultivated varieties: Koshihikari (越光) — the premium standard, from Niigata's Uonuma district the most prized, slightly sticky, rich flavour; Akita Komachi — sweet, soft, gentle flavour; Hitomebore (一目ぼれ) from Miyagi — balanced texture and flavour; Yumepirika from Hokkaido — sweet, glossy; Sasanishiki (ササニシキ) — drier texture, suited for sushi; Haenuki from Yamagata. Each variety has specific applications: sushi rice requires Sasanishiki or Koshihikari's lower amylopectin varieties; freshly harvested shinmai (新米, new rice, October–November) is prized for its moisture and fresh flavour; aged rice (koshinmai, 古米) is drier and better for sake brewing.
Short-grain Japanese rice: slightly sweet, milky, with a characteristic sticky cohesion — the flavour is subtle but essential; Koshihikari has a pronounced sweetness and umami; properly cooked rice has a glossy surface from the naturally released starch
Washing rice (togu) removes surface starch and polishing powder — wash gently, 2–3 times, until water runs clear; the water-to-rice ratio affects texture (standard 1:1.1 by volume produces standard Japanese rice texture); soaking 30 minutes before cooking fully hydrates the grain for even cooking; do not lift the lid during cooking or for 10 minutes after (the steam finishing is essential).
The Japanese rice cooker is one of the greatest kitchen tools invented — modern fuzzy-logic models from Zojirushi or Tiger adjust timing and temperature for different varieties and soaking states; for sushi rice, Koshihikari or Sasanishiki cooked slightly firmer (reduce water by 5%) absorbs sushi-zu better; shinmai (new rice, October harvest) has enough natural moisture that it requires even less water (1:1 ratio rather than 1:1.1); the definitive rice experience in Japan: order a set at Niigata Koshihikari specialist restaurants where the same rice is presented in multiple cooking methods to show its character.
Overwashing rice (removes too much starch, producing dry, separate grains — the Japanese ideal is slightly sticky); not soaking before cooking (dry-grain cooking produces uneven texture); lifting the lid during cooking (destroys the steam pressure that cooks the top layer of rice); using the wrong rice variety for the application (sushi rice requires specific varieties; risotto-style Japanese rice preparations need different amylopectin levels).
Japanese Cooking: A Simple Art — Shizuo Tsuji