Gyeongdan

Gyeongdan belongs to the family of Korean rice cakes called sammneun-tteok, the 'boiled' cakes, set apart from the steamed and pounded kinds by being cooked in water. Its name is written with the Sino-Korean characters 瓊團, 'jade ball,' a nod to the small round shape. The cakes are old enough to appear in nineteenth-century Korean food and seasonal texts: the Imwon Sipyukji records versions coated in soybean powder, in honey and ginger juice dusted with cinnamon, and in red-bean powder, while the Dongguk Sesigi lists them among early-winter seasonal foods. Conceptually they sit close to the Chinese tangyuan and yuanzi that a Chinese cook knows well, but where those are served in syrup, gyeongdan is rolled dry in a coating — that coated, boiled form is the distinctly Korean one. The cakes turn up at holidays, at a child's first-birthday feast, and at ancestral rites.

Soft and yielding at first, then deeply chewy, with the clean stickiness of glutinous rice and very little sweetness of its own. The pleasure is in the contrast between the smooth, springy ball and its dry, fragrant coat — nutty and faintly bitter from toasted sesame, mellow and beany from soybean powder, or earthy-sweet from crushed red bean. A filled one gives way to a soft pocket of sweet paste at the center. Warm from the pot the cakes are at their tenderest; left to cool they tighten and turn firmer.

Boiling, not steaming, is what defines gyeongdan, and it does real work. Glutinous rice flour is almost pure amylopectin, the branched starch that swells and gelatinizes fast in water; cooking the balls fully submerged gelatinizes them quickly and evenly, all the way through. The cakes sink at first, then rise and float once cooked — the gelatinized, expanded interior is less dense than the surrounding water, so floating is the reliable signal that they are done. Lifted straight into cold water, the surface sets and the cooking stops, which keeps the balls springy instead of dissolving into mush. Just as important, the residual moisture left clinging to that set surface is the glue that makes the dry powder coat adhere — a dry ball would shed it. Because glutinous starch retrogrades and hardens as it cools, gyeongdan is at its best the day it is made.