Japanese Cookbook日本の台所 · The Japanese Kitchen

Izumo Zenzai

ぜんざい

Izumo's sweet red-bean soup with grilled mochi — the birthplace dish whose very name traces to the jinzai mochi eaten at the October gathering of the gods.

By Japanese Cookbook Kitchen · May 20, 2026

中国 ChūgokuMuromachi era, 1336–1573

Izumo Zenzai甘味
Prep
15 min
Cook
90 min
Serves
4
Level
Beginner

Izumo, in eastern Shimane, is the land the old chronicles call the country of the gods — and it lays claim to more than shrines. According to a well-documented local etymology, the word zenzai itself was born here. During kamiarizuki, the tenth lunar month when tradition holds that all of Japan's gods travel to Izumo Taisha, worshippers are said to have eaten jinzai mochi, sweet bean and rice cakes offered at the gathering. Over the Muromachi centuries "jinzai," the story goes, wore down into "zenzai," and the name spread across the country with the dish.

Whatever you make of the legend, the soup is straightforward and forgiving, and it rewards patience rather than skill. Cook the azuki all the way soft before you add a grain of sugar, sweeten it slowly, and never skip the closing pinch of salt. The one flourish that matters is the mochi: grill it until it blisters and slumps, then drown it in the hot bean soup. It is winter comfort from the land of eight million gods, and it asks almost nothing of you but time.

Salt is not optional. A real pinch at the end doesn't make the zenzai salty — it makes it taste more of red bean, the way salt wakes up any sweet thing.

板前の一言 · A word from the kitchen

Ingredients材料

Serves 4

  • 200 gdried azuki beans — buy them fresh; old azuki refuse to soften no matter how long you simmer
  • 1.2 Lwater — plus more to top up as it cooks down
  • 140 gsugar — added in two or three stages so the beans don't seize and stay hard
  • 1pinch fine salt
  • 4mochi cakes — kirimochi is fine; grill or toast until blistered and molten inside

Method作り方

  1. Step 1: Boil and discard once

    Rinse the azuki, cover with cold water, bring to a boil, and drain — this first water carries the raw, slightly bitter edge (shibukiri). Return the beans to the pot with fresh water and start again.

  2. Step 2: Simmer until tender

    Simmer gently for about an hour, keeping the beans always just covered with water. They're ready when a bean crushes to paste between your fingers with no chalky core. Rushing this is the one mistake you can't fix later.

  3. Step 3: Sweeten in stages

    Add the sugar in two or three additions, simmering a few minutes between each. Adding it all at once, or too early, toughens the skins and leaves you with hard beans in syrup. Finish with the pinch of salt.

  4. Step 4: Grill the mochi

    Toast the mochi over a flame, under a broiler, or in a dry pan until it puffs, blisters, and turns molten inside. Put a piece in each bowl and ladle the hot zenzai over it so it softens into the soup.

道具 · The tools

Equipment

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  • Stovetop fish grill

    焼き網

    A yakiami grate for salted fish, mochi, and reviving nori over an open flame.

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Questions from the kitchen

What's the difference between zenzai and oshiruko?

Roughly, texture and region. In the Kansai-facing usage common around Izumo, zenzai keeps whole or chunky beans while oshiruko is smoother and more liquid — but the words are used loosely, and Tokyo draws the line differently. Don't lose sleep over it.

Does the name really come from Izumo?

That's the local claim, and it's a documented etymology rather than proven fact. The story goes that at the October kamiarizuki — when the gods gather at Izumo Taisha — worshippers ate jinzai mochi, and that "jinzai" softened over time into "zenzai." Izumo insists, and it's a lovely story either way.

Can I use canned sweet azuki to save time?

Yes, in a hurry — warm good canned tsubuan with a little water to loosen it, add a pinch of salt, and grill your mochi. It won't have the clean fresh-bean flavor of a from-scratch pot, but it's an honest weeknight shortcut.

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