Cucumber Sunomono
Thin cucumber rounds and tender wakame in a light sweet-sour dressing, with salting and squeezing preserving both crunch and concentration.
Jump to recipe- Prep
- 15 min
- Cook
- 5 min
- Total
- 20 min
- Serves
- 4
- Role
- Side dish
Control water before adding vinegar
Salt changes the texture. A brief salting makes thin slices supple enough to dress evenly while retaining a fresh snap.
Squeezing protects the balance. Removing drawn-out moisture prevents the cucumber from immediately weakening the measured rice-vinegar dressing.
Wakame brings a second texture. Properly rehydrated and well-drained seaweed is tender rather than leathery, with a clean marine character beside the cucumber.
Draw out water, then dress
Dissolve and cool the dressing
Combine the rice vinegar, sugar, and soy sauce in a small saucepan. Warm gently, stirring, just until the sugar dissolves; do not boil. Pour into a mixing bowl and leave to cool while you prepare the cucumber.
Rehydrate the wakame
Cover the dried wakame with plenty of cool water and leave for 5 minutes, or until fully expanded and tender. Drain well, squeeze gently to remove excess water, and cut any large pieces into fork-friendly lengths.
Salt and squeeze the cucumber
Slice the cucumbers into thin rounds, about 2 mm thick. Toss with the sea salt and leave for 5 minutes, until the slices bend easily and beads of moisture appear. Squeeze small handfuls firmly but gently; they should remain intact while releasing enough water to avoid diluting the dressing.
Dress and serve
Add the squeezed cucumber, wakame, and sesame seeds to the cooled dressing. Toss thoroughly and leave for 2 minutes so the surfaces take on the sweet-sharp seasoning. Divide among small bowls, carrying a little dressing into each, and serve while the cucumber still has a clean snap.
Build clarity into every slice
Cucumbers
Japanese or Persian varieties have thin skins and modest seed cavities. If using an English cucumber, remove watery mature seeds before slicing.
Slice
Keep rounds uniformly thin but not translucent. A mandoline is useful, provided the guard is used and the setting preserves some body.
Salt
Five minutes is enough for these thin slices. They should flex without becoming limp or tasting aggressively salty.
Vinegar
Japanese rice vinegar is relatively gentle. A more forceful substitute may need a little water rather than more sugar.
Wakame
Dried wakame expands dramatically. Measure before soaking, then squeeze after soaking so it does not carry plain water into the bowl.
Serving
Small bowls suit the dish’s role within a larger meal. Include enough dressing to season each portion, not enough to submerge it.
Sunomono is a category
The Japanese word refers broadly to dishes seasoned with vinegar, not to one fixed cucumber salad. Cucumber sunomono is a familiar member of that category; other versions may include seafood, different vegetables or alternate garnishes. This page names its cucumber-and-wakame form rather than using “sunomono” as though it described only one recipe.
Sweet and sour in context
The dressing can seem emphatic before it meets the cucumber. That concentration is intentional: even after squeezing, the vegetable releases more water. Japanese rice vinegar and sugar create a rounded sweet-tart profile, while a small amount of soy sauce deepens it without turning the liquid dark or salty.
When to assemble
The dressing can be cooled and the cucumber salted shortly before the meal. Combine them close to serving for the clearest texture. If the dressed dish waits, the cucumber will continue releasing water; toss again and judge the balance rather than adding more seasoning automatically.
A defined version within a wider family
Cucumber and wakame is one common pairing, while cucumber alone and versions with octopus, tiny fish or crab also appear. Those additions are variations within the broader vinegar-dressed category, not required proof that a bowl is sunomono.
Research sources: Just One Cookbook’s cucumber and wakame sunomono; Japan Guide’s kaiseki overview of the vinegared sunomono course.