The Light, Crisp Salad Every Japanese Meal Needs
If you've ever sat down to a Japanese meal and been handed a small, chilled bowl of paper-thin cucumber slices glistening in a sweet-tart dressing, you've met sunomono. The name simply means "vinegared things," and this version — the most common one — stars cool cucumbers, chewy bits of wakame seaweed, and a sprinkle of toasted sesame seeds, all tossed in a light rice-vinegar dressing that wakes up your palate.
What makes sunomono special isn't complexity. It's contrast. The cucumbers are salted first, which draws out excess water and leaves them deeply crisp — almost crunchy — so they stay firm in the dressing instead of going limp. The dressing itself walks a line between sweet and sour, just strong enough to cut through rich foods like tempura, grilled salmon, or tonkatsu, and light enough to finish as a refreshing little bite on its own.
This is also one of the easiest Japanese side dishes to pull together. There's no cooking involved — just slicing, salting, and whisking. Fifteen minutes of hands-on work, a short rest while the salt does its thing, and you've got a side dish that keeps well in the fridge and goes with just about anything.
What Makes Sunomono Sunomono
Three things separate sunomono from an ordinary cucumber salad:
- The salt step. Tossing the sliced cucumbers with salt and letting them rest for 10 to 15 minutes pulls out water, concentrates their flavor, and guarantees a crisp texture that holds up in dressing.
- The dressing balance. Rice vinegar, sugar, a touch of soy sauce, and a whisper of salt — sweet, sour, and savory in a ratio that reads refreshing, never harsh.
- The add-ins. Wakame seaweed and toasted sesame seeds are the classic pairings, adding a bit of chew, a savory edge, and visual contrast.
If you like bright, vinegary sides, pair sunomono with a warm bowl of wonton soup — the hot-cold contrast is one of the best parts of a home-cooked Asian meal.
Ingredients
For the salad:
- 2 large English (seedless) cucumbers, about 1 1/4 pounds total
- 1 teaspoon kosher salt, for salting
- 1 tablespoon dried wakame seaweed
- 2 teaspoons toasted sesame seeds
For the sunomono dressing:
- 1/3 cup unseasoned rice vinegar
- 2 tablespoons sugar
- 1 tablespoon soy sauce (Japanese-style, such as Kikkoman)
- 1/4 teaspoon kosher salt
Optional finish:
- 1/4 teaspoon toasted sesame oil
- Thinly sliced scallion greens, for color
How to Make Japanese Cucumber Sunomono
Step 1. Rehydrate the wakame. Place the dried wakame in a small bowl and cover with warm water. Let it sit for 5 minutes, until it unfurls and turns deep green. Drain it well and squeeze out as much water as you can with your hands, then roughly chop any long strands into bite-size pieces. Set aside.
Step 2. Slice the cucumbers paper-thin. Trim the ends off the cucumbers. Using a sharp knife or a mandoline, slice them into rounds about 1/16 inch thick — thin enough to be slightly translucent. This is the one step that really matters for texture: thick slices stay floppy in the center, while thin slices crisp up beautifully after salting.
Step 3. Salt and rest. Toss the cucumber slices with the teaspoon of kosher salt in a colander set over a bowl. Let them rest for 15 minutes at room temperature. You'll see a surprising amount of liquid pool in the bowl — that's exactly what you want out of the cucumbers before they meet the dressing.
Step 4. Squeeze dry. Take handfuls of the salted cucumbers and squeeze firmly to wring out as much water as possible. Don't be shy here — the harder you squeeze, the crisper and more flavor-absorbent they'll be. Transfer the squeezed cucumbers to a mixing bowl.
Step 5. Whisk the dressing. In a small bowl or measuring cup, whisk together the rice vinegar, sugar, soy sauce, and salt until the sugar fully dissolves. Taste it: you want a bright, balanced sweet-tart flavor with a gentle savory backbone. If your rice vinegar is seasoned rather than unseasoned, reduce the sugar to 1 tablespoon and skip the added salt.
Step 6. Toss and chill. Pour the dressing over the squeezed cucumbers, add the rehydrated wakame, and toss well so every slice is coated. Cover and refrigerate for at least 10 minutes — this short rest lets the cucumbers drink in the dressing. The salad keeps well for up to 2 days in the fridge.
Step 7. Serve. Transfer to small bowls or a shallow serving dish, spoon a little of the dressing over the top, and finish with toasted sesame seeds and, if you like, a drizzle of sesame oil and a scatter of scallion greens. Serve cold.
Tips for the Best Sunomono
Use English or Japanese cucumbers. Regular waxy cucumbers have thick skin and lots of seeds, which turn watery in salads. English (hothouse) cucumbers or slim Japanese cucumbers are nearly seedless with thin, edible skin — ideal for thin slicing.
Don't skip the salting step. It feels like an extra chore, but it's the difference between crisp, restaurant-style sunomono and a watery bowl of cucumbers sitting in diluted dressing. The squeeze afterward matters just as much.
Slice thin, then thinner. A mandoline makes quick work of this, but a sharp chef's knife works fine. Aim for 1/16 inch — the slices should flex without snapping. If you cut some thicker, cut some thinner, the texture will be uneven.
Seasoned vs. unseasoned rice vinegar. Check your bottle. Unseasoned rice vinegar is just vinegar — clean and tart. Seasoned rice vinegar already contains sugar and salt, so cut the sugar in the dressing roughly in half and omit the salt, then taste and adjust.
Make it your own. The classic version is cucumber and wakame, but sunomono welcomes company. Try adding thin-sliced cooked shrimp, shredded imitation crab, ribbons of daikon radish, or a few slices of pickled ginger. A pinch of red pepper flakes or a few drops of chili oil nudges it toward spicy. For a heartier version, toss in some cold somen noodles.
What to Serve with Sunomono
Sunomono earns its place as the bright, acidic counterpoint on a Japanese table. Serve it alongside anything rich or fried: vegetable or shrimp tempura, grilled mackerel or salmon, tonkatsu, or a bowl of pork katsu curry. It also pairs beautifully with rice-centered meals — try it on any fried-rice night for a cool-hot contrast, or as a small starter before a steaming bowl of wonton soup.
Because it's served cold and keeps well, sunomono is also a natural fit for bento boxes and make-ahead lunches. Pack the dressing separately if you're prepping more than a day ahead, and toss it together the morning you plan to eat.
Frequently Asked Questions
Can I make sunomono ahead of time? Yes — it's actually better after a short rest. Make it up to 2 days ahead and keep it refrigerated in a sealed container. The cucumbers stay crisp for about 48 hours, then gradually soften. Give it a quick toss before serving.
Why are my cucumbers watery? Almost always, the answer is not enough salting and squeezing. Let the slices rest in salt a full 15 minutes, then squeeze firmly in batches. Also check that you're using English or Japanese cucumbers rather than watery regular cucumbers.
Is sunomono gluten-free? The dish itself is naturally gluten-free except for the soy sauce. Swap in tamari or a certified gluten-free soy sauce and everything else stays the same.
Can I use apple cider vinegar instead of rice vinegar? You can in a pinch, but the flavor will be sharper and fruitier. Rice vinegar is milder and slightly sweet, which is what gives sunomono its delicate character. If substituting, start with 1/4 cup apple cider vinegar and add a little extra sugar to taste.
What does wakame taste like? Wakame has a mild, slightly sweet ocean flavor — much gentler than nori or kombu. Rehydrated, it's silky with a pleasant chew. If you can't find it, you can leave it out and still have a lovely cucumber sunomono, or substitute thinly sliced rehydrated arame.
Japanese Cucumber Sunomono
Ingredients
Method
- Rehydrate the wakame: cover the dried wakame with warm water and let sit 5 minutes until unfurled and deep green. Drain well, squeeze out excess water, and roughly chop long strands into bite-size pieces.
- Slice the cucumbers paper-thin: trim the ends, then slice into 1/16-inch rounds with a sharp knife or mandoline.
- Salt and rest: toss the cucumber slices with the teaspoon of kosher salt in a colander set over a bowl. Rest 15 minutes at room temperature so excess water drains away.
- Squeeze dry: take handfuls of the salted cucumbers and squeeze firmly to wring out as much water as possible, then transfer to a mixing bowl.
- Whisk the dressing: combine the rice vinegar, sugar, soy sauce, and salt until the sugar fully dissolves.
- Toss and chill: pour the dressing over the cucumbers, add the wakame, and toss to coat. Cover and refrigerate at least 10 minutes before serving.
- Serve: transfer to small bowls, spoon over a little dressing, and finish with toasted sesame seeds and the optional sesame oil and scallion greens. Serve cold.
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