By Yoshi | Japan Unveiled
Every year, in the specific days just before the New Year, I watch my neighbour prepare for the occasion of mochitsuki (餅つき — the ritual pounding of mochi). He brings out the large wooden mortar (usu) that has been in his family for decades, sets it on a mat in the garden, and heats the glutinous rice in a bamboo steamer over a gas burner. By mid-morning his adult children have arrived, the mallet (kine) has been retrieved from storage, and the rhythmic alternation of pounding and turning — one person swinging the heavy wooden mallet, another reaching in to fold and turn the rice mass between each blow — produces the deep, resonant sound that carries through the neighbourhood and announces that someone is taking the New Year seriously.
This scene plays out in fewer and fewer Japanese households each year. The rice cooker with mochi programme, the packaged mochi from the supermarket, the pre-made kagami mochi in its plastic case — these have replaced the physical labour of mochitsuki for most urban Japanese families. And yet the tradition persists in enough places that the sound of the wooden mallet is still recognisable, that the ritual still has the power to connect the person who participates in it to something that feels genuinely old and genuinely important.
Mochi — glutinous rice that has been pounded to a smooth, stretchy, intensely sticky paste — is one of the oldest and most culturally significant foods in Japan. It is also one of the most technically interesting and most culinarily versatile, ranging from the sacred offering of the imperial court to the corner convenience store shelf.
The Rice That Makes Mochi: Mochigome
The distinction between the rice that makes mochi and the rice that makes ordinary cooked rice is a fundamental distinction in Japanese food culture, and understanding it is understanding something about the chemistry of mochi’s distinctive character.
Standard Japanese table rice (uruchi mai — うるち米) contains both amylose and amylopectin — the two forms of starch that together constitute rice starch. Amylose is a linear polymer that does not gelatinise easily during cooking; amylopectin is a branched polymer that gelatinises readily. The ratio of these two starches in standard Japanese table rice is approximately 20% amylose to 80% amylopectin.
Glutinous rice (mochi gome — もち米), by contrast, contains essentially no amylose — it is almost entirely amylopectin. This near-total amylopectin composition produces, when the rice is steamed and pounded, the distinctive properties of mochi: the extreme stickiness, the smooth elasticity, the ability to stretch without breaking, and the characteristic chewiness that becomes the defining textural experience of mochi in all its forms. The amylopectin chains, when disrupted by the mechanical action of pounding, form a continuous, homogeneous gel whose physical properties are unlike those of any other food.
The cultivation of mochigome in Japan dates to the earliest rice cultivation — the glutinous variety appears in the archaeological record alongside uruchi mai, suggesting that the two types were cultivated simultaneously from the beginning of Japanese rice agriculture. The ritual and ceremonial importance of mochi in the Shinto tradition reflects the long history: mochi has been offered to the gods for at least as long as there have been gods to offer it to, and the understanding of glutinous rice as the most sacred of the rice varieties is embedded in the religious culture of Japan at its deepest level.
The Mochitsuki Process: How Mochi Is Made
The traditional mochitsuki process is both more demanding and more interesting than any mechanical alternative. The preparation begins the night before: the mochigome is washed and soaked in cold water overnight, which hydrates the starch uniformly and ensures even cooking the following day. The soaked rice is then steamed in the wooden or bamboo steamer (mushikago) over boiling water until fully cooked — the steam rather than submersion cooking method preserves the integrity of the individual grains, which is important for the subsequent pounding.
The cooked rice goes into the mortar (usu) — a stone or wooden vessel of substantial weight, typically 50 to 150 kilograms, hollowed in the centre to contain the rice. The first stage is not the dramatic high-swing pounding but a quieter pressing — the mallet is pushed repeatedly into the hot rice, folding and compressing it, breaking down the individual grain structure. This preliminary pressing, which typically continues for five to ten minutes, transforms the distinct grains into a cohesive mass that can then receive the rhythmic pounding without flying apart.
The pounding itself — the high-swing kine striking the rice mass with full force while a second person reaches in between blows to fold and wet the mass — is the moment that requires genuine teamwork and genuine trust. The turning person’s hands must enter and leave the mortar between each blow; the timing must be precise, the communication between the two participants constant. A mistimed swing injures the turner, and this has happened often enough in Japanese history that the risk is real. The mochitsuki cooperative labour between neighbours is not merely a social ritual — it reflects the genuine practical requirement for a second person that the process demands.
The endpoint of pounding is determined by feel and by sight: the mass should be completely smooth, without visible grain, and should stretch elastically when pulled without tearing. Experienced mochitsuki practitioners judge this by the resistance of the mallet and the sound the mass makes as it is struck — a correctly pounded mochi produces a distinctive hollow resonance that under-pounded mochi does not.
The Sacred Forms: Kagami Mochi and Noshi Mochi
Kagami mochi (鏡餅 — mirror mochi) is the New Year offering of the Shinto tradition — the specific form of mochi that is placed on the household altar, the tokonoma (decorative alcove), and any significant threshold in the Japanese home during the New Year period. The name: kagami (鏡 — mirror) refers to the sacred bronze mirrors of the Shinto tradition, which the stacked round form of kagami mochi is said to resemble. The two round mochi discs, stacked with the smaller on top, decorated with daidai (bitter orange, whose name puns with the word for “generation upon generation”), shide (zigzag paper strips), and kombu (kelp), constitute one of the most immediately recognisable images of Japanese New Year culture.
The kagami mochi is displayed from approximately December 28 (the 29th is avoided because the word for 29, ni-ju-ku, contains the syllable ku which sounds like suffering) and removed on the kagami biraki (鏡開き — mirror opening) of January 11, when the mochi is broken — never cut, cutting being associated with separation — and eaten in oshiruko (お汁粉 — sweet red bean soup with mochi) or ozenzai. The ritual breaking and eating of the offering, returning the sacred food to the human domain after its period of service to the gods, is a characteristic movement in Shinto ritual food culture.
The Sweets: Daifuku, Sakura Mochi, Kashiwa Mochi
The confectionery applications of mochi constitute the most diverse and most immediately accessible dimension of mochi culture for the international visitor. The wrapped mochi sweets of the wagashi tradition — with their seasonal filling and seasonal form — are among the most specifically Japanese of all Japanese food experiences.
Daifuku (大福 — great luck) is the paradigm case: a round mochi skin, slightly thickened, wrapped around a filling of sweet red bean paste (anko). The mochi skin of a properly made daifuku should be soft, smooth, and have the characteristic stretch of well-pounded glutinous rice; it should yield gently to pressure rather than either tearing immediately (under-pounded) or resisting elastically (over-stiffened). The filling should be sweet but not cloying, with a distinct bean flavour that complements the neutral, slightly sticky mochi.
The filling variations: ichigo daifuku (苺大福 — strawberry daifuku), in which a whole strawberry is wrapped with the anko inside the mochi skin, is one of the most celebrated of all modern wagashi innovations — reportedly developed in the late 1980s, and subsequently adopted universally. The visual cross-section of the ichigo daifuku — the red strawberry, the white anko ring, the mochi exterior — is one of the most photographed of all Japanese confectionery.
Sakura mochi (桜餅) takes two distinct regional forms whose partisans argue with the same intensity that Osaka and Hiroshima apply to okonomiyaki. The Kanto (Tokyo) version — chōmeiji-style — uses a crepe-like batter of rice flour as the outer layer, wrapped around anko and then wrapped in a salted cherry leaf. The Kansai (Kyoto-Osaka) version — dōmyōji-style — uses coarsely ground glutinous rice, cooked and formed into a patty around the anko. The salted cherry leaf, in both versions, contributes a distinctive aroma — the coumarin released by the salting process — that is inseparable from the experience of sakura mochi and from the olfactory memory of the Japanese spring.
Kashiwa mochi (柏餅) wraps the mochi and filling in an oak leaf (kashiwa) and is associated with Children’s Day (May 5). The oak leaf is not eaten; its function is aromatic and symbolic. The oak leaf’s specific significance: the oak keeps its old leaves until the new growth replaces them, and this is understood as a metaphor for the continuity of family lineage — old leaves remaining until new leaves are established — making kashiwa mochi an appropriate food for a celebration of children and by extension of family continuation.
Mochi in the Everyday: Zoni, Oshiruko, and More
Beyond the confectionery and the ceremonial, mochi appears throughout the Japanese everyday food culture in preparations that span sweet and savoury, formal and casual.
Ozoni (お雑煮) — the New Year’s soup in which mochi is the central ingredient, surrounded by vegetables and various other components in a broth whose character varies dramatically by region — I described in the dedicated ozoni article. The regional variation of ozoni is itself a complete portrait of Japanese regional food culture, with the square mochi of the Kanto region simmered in a clear chicken-and-fish broth contrasting with the round mochi of the Kansai region in the white miso broth of Kyoto.
Oshiruko (お汁粉) and zenzai (善哉) — the sweet red bean soups with mochi, whose names and exact forms vary between the Kanto and Kansai traditions — are winter comfort foods of the first order, combining the warmth of the red bean broth, the sweetness of the anko, and the satisfying chewiness of the mochi in a preparation whose simplicity and depth are characteristic of the best Japanese sweet foods.
And the simple yaki mochi (焼き餅 — grilled mochi) — a flat piece of mochi, placed directly on the gas burner or the kitchen grill, watched as it slowly puffs and browns and develops the distinctive slightly charred, crispy exterior around a soft, stretchy interior — eaten with a simple dipping of soy sauce, or with the specific accompaniment of dried seaweed, or with sweet soy sauce — is one of the most straightforwardly satisfying cold-weather foods available in the Japanese kitchen, requiring almost nothing by way of technique and producing almost everything by way of comfort.
— Yoshi 🍡 Central Japan, 2026
Enjoyed this? You might also like: “Ozoni: Japan’s New Year Soup and Its Regional Personalities” and “Wagashi: Japan’s Traditional Confectionery and Its Seasonal Calendar” — both available on Japan Unveiled.
