Ichiju-Sansai — The Geometry of the Japanese Meal
Japan — ichiju-sansai as meal structure since Muromachi period (14th century)
Ichiju-sansai (一汁三菜, 'one soup, three sides') is the fundamental architecture of the Japanese meal — the principle that a proper Japanese meal consists of rice, one soup (typically miso soup), and three accompaniments (sides) which together provide nutritional balance, textural variety, and flavour contrast. The three sides typically consist of one main protein dish (yakimono/grilled, nimono/simmered, or agemono/fried), one vegetable side (ohitashi, gomaae, or nimono), and one pickled element (tsukemono). This structure scales from the simple weekday breakfast (rice + miso + pickles + grilled fish, simplified to ichiju-issai — one soup, one side) to a formal 7-course kaiseki meal which is an elaborated version of the same fundamental architecture. The principle ensures that every Japanese meal, regardless of simplicity, achieves the nutritional and flavour balance of a complete meal.