Japan — yōkan introduced from China via Buddhist monks (14th century); the current form with kanten developed when agar was discovered as a gelling agent (17th century, credited to Mitsui Tarozaemon); now one of Japan's most iconic confections
Yōkan (羊羹) is a dense, smooth, sliceable confection made from red bean paste (an), sugar, and agar (kanten) — one of Japan's most ancient and revered wagashi. The name originally referred to mutton (yō) soup (kan) introduced via China, but the Buddhist version replaced meat with bean paste, and the confection has evolved far beyond any connection to its name. There are three principal styles: (1) Neri-yōkan (練り羊羹) — the firm, dense, smoothly sliceable style made with kanten and red bean an; intended for precise cutting and elegant long-term storage; often elaborately flavoured (matcha, chestnut, kinako) or layered in contrasting colours; (2) Mizu-yōkan (水羊羹) — 'water yōkan'; made with higher water content and served cold in summer; much softer, more yielding, cleaner in flavour; the definitive summer Japanese confection; (3) Mushi-yōkan (蒸し羊羹) — steamed yōkan made with flour and eggs alongside the bean base; older technique, not agar-dependent; moister, denser. The firmness of neri-yōkan allows it to be sliced with a thread (yōkan-kiri) rather than a knife — the wire cuts without compressing the smooth surface, producing cleaner edges.
Neri-yōkan: dense, intensely sweet, smooth red bean — the flavour is pure, concentrated an; mizu-yōkan: lighter, cleaner, slightly less sweet with a refreshing coolness — best experienced very cold in summer
{"Agar (kanten) is the gelling agent — gelatin cannot be substituted; agar sets at room temperature and remains firm at higher temperatures","Neri-yōkan kanten ratio: 5g kanten per 500ml liquid — adjust for firmer (more kanten) or softer (less) results","Mizu-yōkan has less agar and more water than neri-yōkan — this is a design choice, not a diluted version","Mould preparation: rinse with cold water before pouring; the moist surface prevents adhesion without flavour contamination","Yōkan-kiri (wire cutter) produces cleaner cuts than a knife — the wire does not compress the smooth surface as it passes through"}
{"Layered yōkan: pour one layer, refrigerate until firm (15–20 minutes), pour a second contrasting layer — creates a visual cut cross-section","Mizu-yōkan summer service: serve in the mould or ramekin with a small pool of kurosato syrup — the dark sugar contrasts with the pale bean paste","Matcha yōkan: add 2 tsp high-quality matcha whisked into a small amount of water before folding into the bean-agar mixture at 70°C — prevents lumping","Neri-yōkan garnishes: whole chestnuts, ginkgo, or sakura blossoms pressed into the surface before setting produces an elegant presentation cross-section"}
{"Substituting gelatin for agar — gelatin melts at body temperature; yōkan served at room temperature or slightly warm would not set","Under-dissolving the agar — kanten powder must be simmered for at least 2 minutes after it appears dissolved to ensure full gelatinisation","Making mizu-yōkan in advance of more than 3–4 days — its higher water content means faster microbial activity; neri-yōkan keeps for weeks","Cutting neri-yōkan with a dull knife — the smooth surface compresses and tears; use a very sharp knife or wire cutter, dampened"}
Wagashi: The Art of Japanese Confectionery (Kazuko Emi) / Japanese Cooking: A Simple Art (Shizuo Tsuji)