Japanese · Yamagata, Japan

Yamagata Imoni River Festival Taro Stew

Imoni is Yamagata Prefecture's beloved autumn tradition: a communal outdoor taro root stew cooked in enormous iron pots beside the Mamigasaki River during the annual Imo-ni Kai festivals held every September. The dish crystallises the Japanese cultural concept of satoyama food — ingredients harvested from the mountain foothills brought to the riverbank for communal preparation. Yamagata-style imoni is a soy-and-sake-based beef stew (as opposed to Miyagi Prefecture's miso-based pork variant), centred on satoimo (taro root) with thinly sliced wagyu or local beef, konnyaku, and green onion. The taro is the hero: its slippery, starchy texture and faint earthy sweetness absorb the soy-flavoured broth. At the official festival the stew is made in a six-metre iron pot using an industrial crane — but the home version is prepared in a large donabe clay pot or Dutch oven over a wood fire or gas burner. The ritual of imoni-kai (imoni gathering) is deeply social: groups of friends and colleagues gather outdoors from early September when the first satoimo harvest coincides with cool mountain air. A unique local tradition dictates that after finishing the stew, curry roux and udon noodles are added to the remaining broth, transforming it into imoni-curry-udon for the second round.

ServesFour portions

Sourced1of 11 in BC

Cook

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600 g

satoimo (taro root)

peeled with damp or gloved hands, halved or quartered

Not yet stocked in British Columbia

300 g

wagyu or local beef

thinly sliced

Your own market

200 g

konnyaku

torn by hand into irregular pieces

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green onions (negi)

cut into 4 cm lengths

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10 g

kombu

one small piece, left whole

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For the broth

1 litre

water

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80 ml

soy sauce

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80 ml

sake

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1 tbsp

sugar

Your own market

For the imoni-curry-udon transformation

2 blocks

Japanese curry roux (S&B mild or medium)

Not yet stocked in British Columbia

200 g

udon noodles

pre-cooked or fresh; added only at the second stage

Not yet stocked in British Columbia

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The Method

Par-boil the peeled, halved or quartered satoimo in unsalted water for 3–4 minutes, then drain. This reduces excess surface starch that would otherwise make the broth gluey.

Combine the water, soy sauce, and sake in a large donabe clay pot or Dutch oven. Add the kombu. Place the drained satoimo into the cold broth — not boiling — so that the taro absorbs flavour gradually as the liquid heats. This is where the dish lives or dies: satoimo added to already-boiling broth tightens on the outside before the interior can drink in the soy-and-sake flavour, producing a starchy core with a seasoned shell rather than a uniformly flavoured piece.

From the canon — The donabe (clay/earthenware pot) is one of Japan's most ancient and most currently celebrated cooking vessels — experiencing a significant renaissance drive… Donabe — Clay Pot Cooking Traditions →

Bring the pot to a moderate simmer over a wood fire or gas burner. Add the hand-torn konnyaku pieces. The ragged surfaces hold broth better than any cut face would. Simmer until the satoimo begins to yield at the edges — a skewer meets slight resistance at the centre.

Add the thinly sliced beef in loose folds across the surface of the broth. Stir gently once. The beef is done when it has just lost its raw colour and the broth carries a faint iridescence from the rendered tallow — do not prolong cooking beyond this point or the slices tighten.

Add sugar to balance and the green onion lengths. Stir once. Remove the kombu. Taste the broth: it should be savoury and clean, with the earthy sweetness of the taro evident beneath the soy. Adjust with a small measure of soy sauce if required. Serve directly from the pot into bowls.

Imoni-curry-udon transformation — second stage: when the stew is largely finished, stir the curry roux blocks into the remaining hot broth until fully dissolved. The residual beef tallow and taro starch in the broth require no additional seasoning. Add the udon noodles and simmer only until heated through and supple — overcooked udon becomes irreparably mushy. Serve immediately.

From the canon — Udon are Japan's thickest noodles — made from hard wheat flour with water and salt, kneaded by foot (ashi de fumu) in the Sanuki tradition of Kagawa prefecture. Udon Noodles →

III

Quality Hierarchy

Reserve — Dewa Okabo or Tsurukubi satoimo from Yamagata hillside farms, wagyu from a named Yamagata producer, hand-ladled over an open wood fire beside moving water.

Estate — Fresh satoimo sourced from a Japanese grocer; thinly sliced domestic wagyu or quality beef short rib; donabe clay pot over a gas ring outdoors.

Market — Satoimo from a well-stocked Asian supermarket; thinly sliced beef from a butcher or shabu-shabu cut; Dutch oven on a domestic hob.

House — Satoimo substituted with waxy new potatoes if unavailable; standard supermarket stir-fry beef; any heavy pot; the soy-and-sake broth ratio maintained regardless.

Sensory Tests

◇Touch. A skewer passes through the largest piece of satoimo with only faint resistance at the very centre — not crumbling, not hard.

◇Sight. The beef has lost all raw colour and the broth surface shows a faint iridescence from rendered tallow.

◇Smell. The broth carries a clean, autumnal savouriness — soy and sake volatiles have mellowed; no sharp raw alcohol remains.

◇Touch. At the curry-udon stage, a strand of udon yields without spring when pressed between finger and thumb — soft but not dissolving.

◇Where it lives or dies. The satoimo must be placed into cold broth and brought up to heat together — not dropped into a boiling pot — so that the starch core slowly opens and the soy-and-sake flavour penetrates the taro completely before the exterior seals.

V · Cross-Cuisine Parallels

Irish stew: communal outdoor cooking of starchy root vegetables in a savoury meat broth as a seasonal social ritual — the satoyama riverbank gathering finds its structural echo in the Irish field-side pot. Korean toran-guk: taro cooked in savoury broth until its released starch contributes body and its earthy-sweet character anchors the dish — the same hero ingredient, the same principle of slow flavour absorption.

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What to Pour

The pairing

Nikka From The Barrel

Nikka Whisky — Miyagikyo Distillery · Miyagikyo — Nikka Distillery

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Whisky

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The whole pairing

VII · Origin & Lineage

Yamagata Prefecture, Tōhoku, Japan. The dish is anchored to the Mamigasaki River and the annual Imo-ni Kai festivals held each September, where the first satoimo harvest from the satoyama foothills coincides with the cool onset of autumn. Yamagata-style imoni is defined by its soy-and-sake-based beef broth, a regional identity marker that distinguishes it categorically from the miso-and-pork variant of neighbouring Miyagi Prefecture. The festival's scale — a six-metre iron pot lifted by industrial crane — codifies the communal character that is inseparable from the dish's meaning. Source: Yamagata Prefecture Tourism and Agricultural documentation; Japanese regional cuisine surveys.

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