Japan — Tsukimi as a court celebration dates to the Heian period (8th century), when the aristocracy gathered to view the moon while floating boats on the palace pond. The food offering tradition (tsukimi dango, susuki, taro) developed through the Edo period when harvest moon viewing spread from court to commoner culture.
Tsukimi (月見, 'moon-viewing') is the Japanese autumn festival of viewing the full harvest moon (in September/October, approximately the 15th day of the 8th lunar month) — and it is as much a food tradition as a viewing tradition. The foods associated with tsukimi are round, representing the moon: tsukimi dango (月見団子, white rice balls, arranged in a pyramid), susuki (silver grass offerings), chestnuts, taro, beans, and most characteristically, raw egg on any food during this period. 'Tsukimi' as a food term specifically refers to a raw egg (the egg yolk = the moon) placed on food: tsukimi udon, tsukimi soba, tsukimi burger (McDonald's Japan's seasonal product), tsukimi oyakodon. The egg-as-moon visual metaphor runs throughout autumn Japanese cooking.
Tsukimi's flavour context is seasonal: the foods associated with the tradition are all autumn harvest foods — chestnuts, taro, edamame, the last rice harvest of the year. The plain white tsukimi dango's neutrality (no sweetness, no flavour) is intentional for offering; the eating foods (tsukimi udon, tsukimi soba) gain their warmth and richness from the raw egg yolk, which, broken into the hot broth, creates immediate ribbons of rich, golden egg that enrich the clear soup and provide a textural contrast to the noodles. The seasonal timing — autumn's first chill — makes the warming bowl of tsukimi udon with its golden moon particularly resonant.
The tsukimi food tradition's core element: round white tsukimi dango — small, plain white mochi balls made from joshinko (non-glutinous rice flour) and water, without filling, arranged in a pyramid of 15 balls (for the 15th night). They are not sweet; they are plain, for offering rather than immediate consumption. The tsukimi food tradition in restaurants and convenience stores: any dish with a raw egg (cracked on top, with yolk representing the full moon) is called 'tsukimi' during September–October. Tsukimi udon: kitsune udon base (dashi-soy broth, aburaage) with a raw egg broken on top just before service.
The beauty of the tsukimi concept for professional cooking is its seasonal metaphor power — the round egg yolk as moon is one of Japanese cuisine's most elegant visual ideas. Tsukimi dishes across different formats: tsukimi risotto (Japanese-Italian), tsukimi cold soba, tsukimi natto rice. The convention is clear: the dish must feature a visually intact egg with a visible, round golden yolk. The surrounding dish provides the 'night sky' against which the 'moon' appears. Contemporary Japanese chefs use the tsukimi metaphor across many preparations far beyond traditional formats.
Confusing the offering tradition (plain white mochi balls, not sweet) with the eating tradition (tsukimi dango sold at shops are often sweet and flavoured — these are for eating, not offering). Scrambling the egg in the hot soup before serving — the tsukimi visual depends on the egg yolk remaining intact as the 'moon'.
Washoku — Elizabeth Andoh; Japanese Farm Food — Nancy Singleton Hachisu