Japan — azuki bean paste confectionery since Heian period; refined in wagashi tradition through medieval period
Anko (餡子, bean paste) is the soul of Japanese confectionery — sweetened azuki bean paste in two fundamental forms: tsubu-an (粒餡, whole bean paste, with bean skins intact, textured) and koshi-an (漉し餡, smooth paste, skins removed, fully smooth). Both begin with the same process: soak azuki overnight, boil three times discarding water each time to remove astringency (aku-nuki), then simmer until soft, add sugar, and dry-stir (neri) until the right consistency. The sugar ratio determines final texture — wagashi shops use refined white sugar for brightness; traditional shops use wasanbon (fine Japanese sugar) or brown sugar for depth. Red bean paste quality is determined by its clean sweetness, not cloying or harsh.
Clean sweet bean flavor with subtle earthiness — the pure taste of well-made anko defines Japanese sweet culture
{"Aku-nuki (astringency removal): boil azuki, discard water 2-3 times — removes tannins from skins","Simmer to exact tenderness: beans should crush between fingers with slight pressure before sugar addition","Sugar timing: add after beans are fully soft — adding too early hardens bean skins","Neri (stirring to dry): vigorous stirring in wide pan over medium heat evaporates moisture — determines consistency","Tsubu-an vs koshi-an: koshi requires straining through fine mesh after cooking — removes all skin","Sweetness level: wagashi shops use 80-100g sugar per 100g dried beans — adjustable to application"}
{"Wasanbon sugar anko: substitute 30% of white sugar with wasanbon — more nuanced sweetness","White bean (shiro-an): same technique with white cannellini or lima beans — used in spring wagashi","Chestnut anko (kuri-an): cooked chestnuts substituted for azuki — autumn wagashi premium option","Moisture test: correct tsubu-an holds shape when scooped and placed — doesn't spread or collapse","Storage: anko keeps refrigerated 5 days; frozen 3 months — freeze in portioned scoops"}
{"Adding sugar before beans are fully soft — tightens skins, prevents even cooking","Not doing aku-nuki — harsh, astringent bean paste results from skipping initial boils","Under-drying paste — wet anko doesn't hold shape in wagashi, sticks, molds quickly","Over-stirring koshi-an — becomes too smooth and loses characteristic silky-dense character"}
Wagashi Making — Yoshiko Ando; Japanese Sweet Art — Wagashi documentation; Azuki producers Hokkaido reference