Yokan

Originally a Chinese dish (yang geng) — a lamb broth that congealed into a savory jelly when cooled — brought to Japan by Zen monks in the Kamakura period (12th–13th c.). Buddhist vegetarianism stripped the lamb; cooks substituted azuki paste set with kuzu, then later agar after it was discovered in 1658. The modern firm neri-yokan dates from the Edo period, where it became a samurai-class gift item.

Originally Chinese yang geng (lamb soup), brought by Zen monks in the Kamakura period (12-13th c.). Buddhist vegetarianism stripped the lamb; cooks substituted azuki paste set with kuzu, then agar after its 1658 discovery. Properly made yokan has a multi-year shelf life — samurai field rations.

A dense, glossy block sliced into rectangles — firm enough to hold a clean edge under the knife, soft enough to part on the tongue. Flavor is concentrated red bean, sweet but with the earthy bitterness of azuki husk. Served in thin slices with green tea; the bitterness of matcha cuts the sugar load. Texture is between fudge and very firm jelly.

Agar is the load-bearing ingredient — unlike gelatin, it sets at room temperature and holds firm up to 85°C, which is why yokan ships and stores without refrigeration. The bean paste is cooked with sugar to over 60% sugar concentration, which acts as a preservative. Properly made yokan has a multi-year shelf life and was carried as samurai field rations.