Seasonal Eating Calendar Shun No Shokuzai Full Guide
Japan — shun concept documented from at least the Heian period (794–1185); formalised in kaiseki through the 24 solar terms (nijushi sekki) calendar alignment; encoded in Japanese poetic culture (seasonal reference words, kigo, in haiku)
Shun (旬) — the concept of ingredients being at their peak seasonal perfection — is the organising philosophy of Japanese cuisine. Rather than a theory imposed on cooking, shun is an empirical observation of when each ingredient achieves its maximum sugar content, minimum water content, optimal fat accumulation, or most complex aromatic development. The Japanese seasonal calendar for food is extraordinarily detailed: spring (haru, March–May) brings bamboo shoots, young fish (hatsu-gatsuo skipjack tuna), wild mountain vegetables (sansai), cherry blossoms, and the first bonito; summer (natsu, June–August) brings unagi eel (Doyo no Ushi no Hi), ayu sweetfish, myoga, edamame, corn, and cold noodle culture; autumn (aki, September–November) brings the peak of the calendar — matsutake mushrooms, sanma Pacific saury, kuri chestnuts, nashi pears, and the season's best sake (hiyaoroshi); winter (fuyu, December–February) brings crab, oysters, oden, fugu pufferfish, and the richest fatty fish.