Meet your new favorite side dish: Japanese cucumber salad, a crisp, tangy sunomono with silky wakame and a light rice vinegar dressing. It comes together in minutes, tastes super refreshing, and goes with everything from weeknight teriyaki to sushi night at home.

I make this when I want something clean and crunchy that wakes up the palate without weighing the meal down. You’ll slice cucumbers paper-thin, rehydrate dried wakame, and toss both in a sweet-tart dressing with a hint of umami. It’s simple, fast, and seriously satisfying.

Why This Japanese Cucumber and Wakame Salad Works

Light, bright flavor: Rice vinegar, sugar, and a touch of soy create the classic sunomono balance of sweet and tangy.
Crunch meets silk: Crisp cucumbers contrast with tender wakame for an addictive texture combo.
Five minutes of effort: Slicing and stirring do all the work—no stove required.
Pairs with everything: Serve alongside grilled salmon, tempura, gyoza, or a big bowl of rice.
Healthy and hydrating: Cucumbers bring water and vitamins; wakame adds minerals and a gentle umami boost.

Ingredients

For the Salad

2 Japanese cucumbers (or 1 large English cucumber), very thinly sliced
2 tablespoons dried wakame (cut variety), rehydrated
1 teaspoon kosher salt (for salting cucumbers)
1 tablespoon toasted sesame seeds (white or a mix of white and black)

For the Sunomono Dressing

3 tablespoons unseasoned rice vinegar
1 to 1½ tablespoons sugar (adjust to taste)
1 teaspoon soy sauce (or tamari for gluten-free)
1 teaspoon mirin (optional, for roundness)
Pinch of sea salt

Optional Garnishes

Thinly sliced scallions
Paper-thin red onion (a little goes a long way)
Shaved ginger or a few drops of sesame oil for fragrance

How to Make This Cucumber Wakame Sunomono

Prep the cucumbers: Slice cucumbers as thinly as you can. A mandoline makes this easy. Toss slices with 1 teaspoon kosher salt and let sit 10 minutes to draw out water.
Soak the wakame: Place dried wakame in a bowl, cover with cool water, and soak 5–10 minutes until soft. Drain well and squeeze out excess water. If pieces feel large, chop into bite-size strips.
Make the dressing: In a small bowl, whisk rice vinegar, sugar, soy sauce, mirin (if using), and a pinch of salt until the sugar dissolves. Taste and adjust sweetness or acidity.
Remove cucumber moisture: Rinse the salted cucumbers briefly to remove excess salt, then squeeze gently by handfuls to remove as much water as possible. This step keeps the salad crisp and prevents dilution.
Toss and finish: Combine cucumbers and wakame in a bowl. Pour over dressing and toss to coat. Sprinkle with toasted sesame seeds and any optional garnishes. Serve immediately or chill 10–20 minutes for extra refreshment.

Flavor tip: A few drops of sesame oil add aroma but can overwhelm—use sparingly.
Texture tip: Salting and squeezing the cucumbers is the secret to a crunchy, non-watery salad.

How to Store Leftover Sunomono

Refrigerate: Keep in an airtight container for up to 2 days.
Keep components separate: For best crunch, store the dressing separately and toss right before serving.
Revive the flavor: If the salad tastes muted after chilling, add a splash of rice vinegar and a pinch of sugar before serving.
Avoid freezing: Freezing destroys the crisp texture.

Benefits of This Fresh Cucumber and Wakame Salad

Light and low-calorie: Big flavor without heaviness—perfect alongside rich mains.
Mineral-rich wakame: Seaweed brings iodine and other trace minerals many diets lack.
Hydrating and refreshing: Cucumbers add water and crunch, ideal for hot days or spicy meals.
Quick prep: Minimal ingredients, minimal time, maximum payoff.
Naturally dairy-free and easily gluten-free: Use tamari or gluten-free soy sauce.

Common Mistakes to Avoid

Skipping the salt-and-squeeze step: You’ll get watery salad and bland flavors.
Using seasoned rice vinegar by accident: It already contains sugar and salt; your dressing can turn overly sweet. If you use it, reduce added sugar and salt.
Over-soaking the wakame: It can turn mushy. Soak just until soft, then drain and squeeze.
Heavy sesame oil: A little goes far; too much masks the clean, bright profile.
Not tasting the dressing: Rice vinegars vary. Adjust sugar and vinegar for balance.

Variations You Can Try

Crab sunomono: Add shredded imitation crab or real crab meat for a sushi-bar vibe.
Octopus (tako) version: Toss in thin slices of cooked octopus for a classic izakaya twist.
Spicy kick: Stir in a little rayu (chili oil) or sprinkle shichimi togarashi.
Citrus pop: Add a squeeze of yuzu or lime and a bit of zest for brightness.
Herby crunch: Mix in sliced shiso leaves or fresh dill for a clean, aromatic note.
Extra veg: Add thinly sliced radish or carrot ribbons for color and bite.
Sesame-forward: Increase sesame seeds and add a 1/4 teaspoon sesame oil for nutty depth.

FAQ

What cucumbers work best?

Japanese or Persian cucumbers deliver the best crunch and minimal seeds. English cucumbers also work—just cut lengthwise and scrape out large seeds if needed.

Can I make this ahead?

Yes—up to a day ahead if you keep cucumbers salted, squeezed, and undressed. Toss with dressing right before serving for best texture.

Do I need to peel the cucumbers?

No peeling required. The thin skin adds color and crunch. If using thick-skinned varieties, peel alternating stripes.

What if I can’t find wakame?

Use dried seaweed salad mix or skip it and add extra sesame seeds and a touch more soy. The salad stays delicious and refreshing.

Is this gluten-free?

Yes, with tamari or certified gluten-free soy sauce. The rest of the ingredients are naturally gluten-free.

How sweet should the dressing be?

Lightly sweet is ideal. Start with 1 tablespoon sugar and increase to 1½ if you prefer a sushi-bar level sweetness.

Conclusion

This Japanese cucumber and wakame sunomono brings crisp texture, bright flavor, and a breezy prep that fits any night. Slice, soak, whisk, and toss—you’ll have a cool, balanced side that lifts every plate. Make it simple, keep it fresh, and don’t skip the salt-and-squeeze. Dinner just got lighter and livelier.