Dressings & Emulsified Sauces

Sunomono Dressing (Vinegar to Dashi to Sugar)

Also: Sanbaizu, Three-Flavors Vinegar, Japanese Cucumber Salad Dressing

A 3:2:1 ratio of rice vinegar to dashi to sugar that produces sanbaizu — the restrained, umami-softened dressing at the heart of Japanese vinegared salads.

Sunomono dressing, known formally as sanbaizu (literally 'three-flavor vinegar'), combines rice vinegar, dashi, and sugar in balanced proportions to create a dressing that is sour but never harsh. The dashi component is the key distinction from Western vinaigrettes: it contributes glutamate-rich umami that rounds and softens acidity, allowing the dressing to taste complete without oil. A small amount of soy sauce or light mirin may be added to extend the flavor, but the core structure is three ingredients.

The proportions

Japanese rice vinegar (komezu) · 3Dashi (ichiban dashi) · 2Sugar (or mirin) · 1Light soy sauce (usukuchi) · 0.5 optional
3
Japanese rice vinegar (komezu)Mild, clean-tasting vinegar at 4–4.5% acidity; do not substitute distilled white vinegar or cider vinegar — the flavor profile differs markedly
2
Dashi (ichiban dashi)First-draw kombu-and-katsuobushi dashi; the glutamates bridge acid and sugar, creating roundness absent in plain vinegar dressings
1
Sugar (or mirin)White sugar for clean sweetness; mirin adds complexity but also color — use sugar for pale sunomono like cucumber; mirin for heartier preparations
0.5 optional
Light soy sauce (usukuchi)Optional small addition to deepen savory notes without darkening pale vegetables; omit for pure, bright flavor

Method

Combine rice vinegar, dashi, and sugar in a small saucepan. Heat gently over low heat, stirring until sugar is fully dissolved — do not boil, which would drive off the delicate rice vinegar esters. Remove from heat and cool completely before dressing vegetables. Alternatively, combine cold if using fine caster sugar and stir vigorously until dissolved. Dress salted, squeezed cucumber or other vegetables immediately before serving; do not marinate longer than 15 minutes or textural integrity deteriorates.

Tips

  • Salt and thoroughly squeeze vegetables — cucumber especially — before dressing: excess water dilutes the carefully calibrated ratio
  • Cool the dressing completely before use; warm dressing wilts delicate vegetables on contact
  • Rest dressed sunomono for 5 minutes after tossing, then taste and correct — flavors integrate and appear to sweeten slightly as they meld
  • Ichiban dashi (first draw) is worth making from scratch here; the delicacy of the dressing is undermined by powdered dashi granules which taste saltier and less clean
  • For wakame sunomono, reconstitute dried wakame minimally (2–3 minutes) and squeeze dry — over-hydrated wakame turns slimy and thin dressing further

Variations

  • Nihaizu (two-flavor vinegar)

    Rice vinegar and soy sauce only, no sugar; more austere; used for robust ingredients like cooked crab or octopus where sweetness would compete

  • Tosa-zu

    Sanbaizu finished with katsuobushi (bonito flakes) steeped in the warm vinegar for 5 minutes then strained; adds deeper umami and a subtle smoky note

  • Amazu (sweet vinegar)

    Sweeter than sanbaizu (ratio moves toward equal vinegar and sugar); used for pickled ginger (gari), lotus root, and myoga; dashi is reduced or omitted

  • Ponzu-based sunomono

    Replace dashi with ponzu for a citrus-forward, more complex acid profile; adjust sugar downward as ponzu already contains mirin

Related ratios

  • Shares the dashi-plus-acid structure; ponzu is richer and used as a dipping sauce where sunomono dressing is lighter and applied to salads

  • Same sour-sweet balance logic using Southeast Asian fermented seasoning instead of Japanese umami stock

  • Quick Pickle Brine (Vinegar to Water to Sugar to Salt)

    Amazu variant overlaps with quick pickling brine; the distinction is proportion of sugar and the presence or absence of dashi

Appears in

Kyuri no sunomono (cucumber and wakame salad)Tako sunomono (octopus vinegar salad)Crab and cucumber sunomonoHarusame sunomono (glass noodle salad)Mozuku sunomono (seaweed salad)

References

  1. 1.Japanese Cooking: A Simple Art — Shizuo Tsuji
  2. 2.The Japanese Kitchen — Hiroko Shimbo
  3. 3.Japan: The Cookbook — Nancy Singleton Hachisu

Confidence: high

Notes

Why dashi changes everything

In a plain vinegar-and-sugar dressing, acidity and sweetness exist in tension — the palate has to choose which to register. Dashi's glutamates act as a bridge, a phenomenon related to the taste mechanism whereby umami lowers the threshold for perceiving both sweet and sour simultaneously, making the whole dressing taste more integrated and complete. This is why sanbaizu tastes 'rounder' than an equivalent European vinaigrette despite using identical proportions of acid to sweet.

The pre-salting step is part of the ratio

Sunomono vegetables are always salted and pressed before dressing. This 2–5 minute salting removes surface moisture and lightly seasons the vegetable interior. The ratio above assumes pre-salted ingredients — if you dress unsalted cucumber, the dressing will taste salty and the vegetable wet. The salt used in pre-salting is typically rinsed off before dressing, leaving the salinity to come from the light soy (if used) and the dressing itself.