Japan — mochitsuki tradition documented from the Yayoi period (300 BCE to 300 CE); ritual associations with Shinto ceremonies; New Year mochi culture codified in Heian period court documentation; commercial mochi production from Edo period
Mochi (餅) — the glutinous, sticky cake made from pounded sweet rice (mochigome) — is one of Japan's most ancient and symbolically significant foods, consumed at New Year (kagami mochi offerings), festival celebrations (kirimochi for ozoni soup), and everyday preparations (mochi ice cream, daifuku wagashi, onigiri). The traditional production involves steaming mochigome (glutinous short-grain rice) until fully cooked, then pounding in a large wooden mortar (usu) with heavy wooden mallets (kine) in the mochitsuki pounding ceremony — the rhythmic pounding breaks down the cell structure and releases the amylopectin starch in a way that creates the characteristic cohesive, elastic, stretchy texture impossible to achieve through other starch cooking methods.
Pure, neutral rice starch sweetness; the flavour is largely textural — the extraordinary stretch, chewiness, and resistance that gives mochi its unique mouth experience; the flavour comes from toppings and accompaniments
The science: mochigome contains almost no amylose (the linear starch that creates non-sticky short-grain rice structure) and is almost entirely amylopectin (the branched starch that creates maximum cohesion and stretchiness). Cooking and then pounding converts the gelatinised starch into a continuous, extremely cohesive dough. The pounding must continue until the mixture is completely smooth and pulls away from the mortar cleanly — under-pounded mochi retains grain texture and breaks rather than stretches. For home production, a mochi-making machine (mochiki) or standing mixer with dough hook provides a reasonable substitute for the mortar.
The kinako-dusted mochi tradition (from Kyoto's Fushimi area, and throughout Japan at New Year): slice kirimochi into rectangles, toast in a toaster oven or over a gas flame until puffed and golden, then dip in kinako-sugar mixture or coat with anko — the contrast between crispy exterior and molten interior is extraordinary. Fresh-pounded hot mochi eaten immediately with katsuobushi, nori, and soy sauce (isobeage style) is mochitsuki's immediate reward. The kagami mochi offering (two round mochi with an orange on top) placed before the household shrine at New Year is one of Japan's most enduring ritual food objects.
Using regular short-grain Japonica rice instead of mochigome — the starch ratio produces a crumbly, non-elastic result. Under-cooking the mochigome before pounding — residual ungelatinised starch prevents the correct texture development. Not working quickly — mochi begins hardening within minutes of pounding and must be shaped while still warm. Attempting to stretch or cut cold mochi — it must be either warm-fresh or re-heated in a microwave or in water before working.
Tsuji, Shizuo — Japanese Cooking: A Simple Art; Japan Mochi production documentation; Hosking, Richard — A Dictionary of Japanese Food