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Japanese · Japan

Japanese Sunomono: Vinegared Dishes, Sanbaizu Chemistry, and the Art of Acid Balance

Sunomono (酢の物, 'vinegar things') encompasses Japanese cuisine's broad tradition of acid-dressed dishes that serve as palate-refreshing elements within the larger meal structure — the equivalent of the acidic component in the kaiseki meal's sequence that resets the palate between richer preparations. The foundational dressing is sanbaizu (三杯酢, 'three-cup vinegar') — a calibrated mixture of rice vinegar, soy sauce, and mirin in approximately equal parts, with minor regional and individual variations. The name 'three cups' refers to the three components in equal measure rather than three cups as a volume. A simpler alternative is amazu (甘酢, sweet vinegar) — rice vinegar, sugar, and salt without soy sauce, used for preparations where a clean, colorless dressing is preferred (white fish sunomono, chrysanthemum turnip). The technique of proper sunomono preparation extends beyond the dressing to the vegetable and seafood preparation: wakameletting — blanching wakame (seaweed) in boiling water for 10–15 seconds to brighten color and soften texture before chilling, slicing cucumber very thin (typically 1–2mm using katsuramuki or simple slicing) and salting to draw moisture so the dressing isn't diluted, and squeezing blanched vegetables firmly to remove maximum water before dressing. The assembled sunomono is never soggy: the pre-processing removes the water that would dilute the dressing after assembly. Classic sunomono include kyūri to wakame no sunomono (cucumber and wakame), tako no sunomono (octopus in vinegar dressing), and hamaguri no sunomono (clam sunomono). Seasonal variation is fundamental: spring brings bamboo shoot sunomono, autumn features chrysanthemum turnip, winter includes oyster and ponzu.

ServesFour small portions (50–80 g each)
Sourced2of 8 in BC
Cook
I

The Market List

The benchmark for each ingredient, and who stocks it near you. Tap a stockist to go straight to the product.

For the sanbaizu
3 tbsp
rice vinegar
seasoned or plain; adjust sweetness accordingly
Your own market
3 tbsp
3 tbsp
mirin
Not yet stocked in British Columbia
30 ml
dashi
optional; rounds the acid edge
Not yet stocked in British Columbia
For the cucumber and wakame
2
Japanese cucumbers
sliced 1–2 mm on a mandoline
Your own market
1 tsp
fine salt
for pre-salting cucumber
Your own market
30 g
dried wakame
reconstituted in cold water before blanching
Not yet stocked in British Columbia
To garnish
1
yuzu
zest only, cut in a narrow strip
Origin · JapanPurely Artisan Foods · San Diego →

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II

The Method

1
Combine rice vinegar, soy sauce, and mirin in equal volumes to make the sanbaizu. If using dashi, add it now at 10–20% of the total dressing volume. Stir briefly to integrate. The dressing should smell bright and sharp with a distinct sweet undertone from the mirin; no single element should dominate.
2
Slice cucumber to 1–2 mm. Toss with fine salt and set aside for 15–30 minutes. The salt draws surface and cellular moisture from the flesh. At the end of the resting period, take the cucumber in both hands and squeeze firmly — the bundle should feel almost dry, and the expressed liquid should run freely. Insufficient squeezing here dilutes the dressing at table and softens texture unacceptably: this is the step on which the dish lives or dies.
3
Reconstitute dried wakame in cold water until pliable. Bring a small pot of water to a full boil and submerge the wakame for 10–15 seconds only. Transfer immediately to ice water. The colour brightens from brown-grey to a vivid deep green — that colour change is the signal that blanching is complete. Drain and squeeze firmly.
4
Arrange the squeezed cucumber and wakame in four small bowls — glass dishes, celadon, or seasonal ceramic are all appropriate. Keep portions restrained: 50–80 g total per vessel. The dish functions as a palate cleanser, not a salad course.
5
Dress the sunomono only at the moment of service. Spoon sanbaizu over each portion — enough to coat and pool lightly beneath the vegetables, not to flood them. Pre-dressed sunomono becomes watery within 10 minutes; the window between dressing and eating is brief.
6
Lay a single narrow strip of yuzu zest across each portion. Serve at slightly cool rather than refrigerator temperature — 10–15°C allows the acid-sweet balance of the sanbaizu to fully register on the palate. The dressing should taste bright and immediately refreshing, with the soy's umami as a quiet undertone.
III

Quality Hierarchy

01
Reserve — Freshly pressed yuzu juice and hand-cut zest for the garnish; dashi made from first-draw kombu and katsuobushi; artisan rice vinegar with measured acidity and natural sweetness.
02
Estate — Good-quality seasoned rice vinegar; hon-mirin (true mirin, not mirin-style condiment); dried wakame from a reliable Japanese supplier; cucumber from a farmers' market, sliced by hand with care.
03
Market — Supermarket rice vinegar and mirin; commercially packed dried wakame; standard cucumber; pre-made dashi stock or dashi powder dissolved in warm water.
04
House — The sanbaizu formula holds at any quality level — equal parts rice vinegar, soy sauce, and mirin — but without the squeeze step and without serving immediately after dressing, no quality of ingredient will save the dish.
IV

Sensory Tests

◇Touch. Squeezed cucumber bundle feels nearly dry in the hand; expressed liquid runs freely when pressure is applied — the vegetable holds its shape but yields no further water.
◇Sight. Blanched wakame turns from brown-grey to vivid deep green within 10–15 seconds in boiling water — the colour change marks the end of blanching.
◇Smell. The finished sanbaizu smells bright and sharp with a clear sweet undertone; neither the vinegar nor the soy should read as dominant before tasting.
◇Taste. At service, the dressing tastes immediately refreshing and acid-forward, with sweetness from the mirin and a quiet umami depth from the soy; the balance is clean, not harsh.
◇Where it lives or dies. The cucumber must be salted, then squeezed with maximum pressure until almost dry — undrained moisture will dilute the sanbaizu and render the texture unacceptably soft within minutes of dressing.
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VI

What to Pour

The pairing
Aramasa No. 6 X-type Junmai Ginjo
Aramasa Shuzo · Yamagata
Not yet stocked in British Columbia
Sake
From British Columbia

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Without alcohol

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The whole pairing
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Where the dish comes from and how it came to be — on every recipe.
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Sourced through Provenance

The hands behind the plate.

Purely Artisan Foods
San Diego · soy sauce, yuzu
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