Kohakutou is a Japanese wagashi of agar jelly and sugar. Wikipedia documents it within the broader wagashi tradition, which depends on kanten (agar) — the gelling agent invented in Japan during the 1600s. The confection is made by setting agar and sugar in a mold, then air-drying it for several days. The drying process is what gives kohakutou its distinctive character: the exterior crystallizes into a hard, jewel-like shell while the interior remains soft and jelly-like. The name means amber sugar, from its resemblance to amber when colored.
A piece of kohakutou is a small, faceted gem — its surface a hard, crystalline crust that crunches between the teeth, its interior a yielding, jelly-soft core. The contrast of the crisp crystalline exterior and the soft agar interior is the defining pleasure. The flavor is simply sweet, sometimes flavored with yuzu or matcha. Eaten as a small confection with tea.
Kohakutou rests on the differential drying of agar jelly. Agar and sugar are dissolved together and set in a mold; the set jelly is then cut into pieces and left to air-dry for three to seven days. During drying, moisture evaporates from the surface first; the sugar at the surface recrystallizes as the water leaves it, forming a hard, crystalline crust. The interior, protected by the crust, retains its moisture and stays soft. The rate of drying controls the crust thickness — slower drying (cooler, more humid conditions) gives a thinner crust and softer overall texture. The crystallization is what gives the characteristic jewel-like appearance: the sugar crystals catch and refract light.
Variations
Colored and flavored with yuzu, matcha, plum, or rose; the agar-sugar, dried-to-crystalline-crust form is the constant.
On the Palate
Where Kohakutou sits in the Japanese flavor cloud
Ingredients
Serves 10How it's made
6 steps · 20 min
- 110 min
Dissolve agar in water; add sugar and any flavoring or color.
- 25 min
Boil; pour into a shallow tray.
- 3120 min
Chill until set.
- 45 min
Cut into small pieces.
- 55 min
Air-dry at room temperature for 3-7 days until the exterior crystallizes.
Watch outAir-dry three to seven days until the surface crystallizes into a hard crust — cooler, more humid air gives a thinner shell and softer center; rush it warm and it cracks.
- 65 min
Store in an airtight container; serve with tea.
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