Need some cucumber inspiration? Try Japanese Cucumber Salad (Sunomono) that’s light, healthy, and incredibly refreshing! This sweet and sour cucumber salad with wakame seaweed makes a versatile side dish to serve with any Japanese meal.

Small Japanese bowls containing Japanese cucumber salad called Sunomono served on top of a wooden tray along with a cucumber shaped chopstick rest and chopsticks.

When cucumbers are at their peak in gardens and markets, we often find a few lingering around at the kitchen counter. If you are in need of some cucumber inspiration today, I hope you try this refreshing Japanese Cucumber Salad called Sunomono (酢の物). This is one of the most popular appetizers at the dinner table in Japan, and it’s simple and very easy to prepare in a short time.

What is Sunomono?

Sunomono (酢の物) refers to vinegar-based dishes, and they are commonly served as a side dish to the main meal. These light refreshing vinegar salads are a great start to any meal as the sourness from the vinegar helps whet your appetite. 

Su (酢)” means vinegar in Japanese, and when we mention “sunomono,” it typically refers to Japanese cucumber salad. During the heat of summer and our bodies naturally gravitate towards ‘cooling’ food, this cucumber salad makes a wonderful seasonal side dish, especially for grilled fish or meat.

It is tangy, crunchy, and so easy to whip up. Plus, its health benefits are good enough reasons to enjoy on a weekly basis.

Small Japanese bowls containing Japanese cucumber salad called Sunomono served on top of a wooden tray along with a cucumber shaped chopstick rest and chopsticks.

How to Make Japanese Cucumber Salad

The Ingredients You’ll Need

  • Japanese or Persian cucumbers
  • Dried wakame seaweed
  • Toasted white sesame seeds
  • Dressing: rice vinegar, soy sauce, sugar, and salt

Substitutions

  • Japanese cucumbers can be substituted with Persian cucumbers. Both of them don’t contain big seeds like American cucumbers. If you can’t find Japanese or Persian cucumbers, you can use an English cucumber, but scoop out the seeds with a spoon because seeds contain moisture that will dilute the dressing.
  • You can skip dried wakame seaweed if you’re not a fan. You can read its health benefits in case you’re interested. Couldn’t find wakame seaweed? Try thinly sliced onion, radish, or carrots for a layer of texture and for additional nutrients. 

The Cooking Steps

  1. Rehydrate dried wakame seaweed in water for 5 minutes.
  2. Cut the cucumbers into thin slices. Sprinkle the salt and distribute it evenly. Set aside for 5 minutes.
  3. Squeeze out the liquid from the rehydrated wakame seaweed and cucumbers.
  4. Make the dressing. Heat the dressing ingredients in a saucepan until the sugar is dissolved.
  5. Combine the well-drained seaweed and cucumber, sesame seeds, and dressing, and mix them all together. Serve and enjoy!
Small Japanese bowls containing Japanese cucumber salad called Sunomono.

3 Cooking Tips

  1. Choose Japanese or Persian cucumbers. Avoid American cucumbers that contain big seeds and more moisture. Their skin is also waxy and thick, which is not ideal for this salad.
  2. Generously salt the cucumbers. The salt helps draw out the moisture from the cucumbers so it does not dilute the salad dressing after mixing. This ensures a great crunch for the salad.
  3. Squeeze out the liquid from the rehydrated wakame seaweed and cucumbers. If you don’t, the dressing will be diluted and the salad will have a bland taste.
4 kinds of Sunomono (Japanese Cucumber Salad) in bowls..

Non-Vegetarian Variations

The recipe below shows the basic method of making sunomono. You can easily change things up and make variations of the salad by adding the following:

  • Crab meat – I am unfortunately allergic to crab, so I used imitation crab meat in this recipe. I have a variation of the recipe here.
  • Boiled octopus – I buy boiled octopus from a Japanese grocery store. It’s sold in the sashimi section and the package usually says “octopus sashimi.” You just need to cut it into very thin slices. I have a variation of the recipe here.
  • Shirasu (boiled baby anchovies) – Baby anchovies are commonly used in Japan, and they are rich in calcium. If you live by the ocean and have access to anchovies, you should give this a try!
  • Ground sesame seeds to the dressing – I have a variation here that I used spiralized cucumbers.

Enjoy the perfect balance of sweet and sour in this delicious cucumber salad! 

4 kinds of Sunomono (Japanese Cucumber Salad) in bowls..

What to Serve with Japanese Cucumber Salad

If you want to check out other Japanese side dish recipes, read 15 Easy Japanese Side Dish Recipes.

Small Japanese bowls containing Japanese cucumber salad called Sunomono.

Wish to learn more about Japanese cooking? Sign up for our free newsletter to receive cooking tips & recipe updates! And stay in touch with me on FacebookPinterestYouTube, and Instagram.

Small Japanese bowls containing Japanese cucumber salad called Sunomono.

Japanese Cucumber Salad (Sunomono)

4.68 from 142 votes
Need some cucumber inspiration? Try Japanese Cucumber Salad (Sunomono) four different ways! This sweet and sour cucumber salad with wakame seaweed makes a versatile side dish to serve with any Japanese meal. It‘s light, healthy, and incredibly refreshing.

Video

Prep Time: 15 minutes
Total Time: 15 minutes
Servings: 4

Ingredients
 
 

For the Dressing

For the Sunomono

For the Variations (Optional)

Japanese Ingredient Substitution: If you want substitutes for Japanese condiments and ingredients, click here.

Instructions
 

  • Gather all the ingredients.
    Japanese Cucumber Salad (Sunomono) Ingredients

To Make the Dressing

  • In a saucepan, combine 4 Tbsp rice vinegar (unseasoned), 2 Tbsp sugar, ½ tsp Diamond Crystal kosher salt, and ½ tsp soy sauce.
    Japanese Cucumber Salad 2
  • Heat over medium heat and whisk it well together. When the sugar is dissolved completely, remove the saucepan from the heat and let it cool. Tip: If you decrease the sugar amount (which I don't recommend), you may find that the vinegar tastes too strong. If it's still too strong for you after adding the cucumbers, you can dilute it with a very small amount of Dashi (Japanese soup stock), Vegan Dashi, or water.
    Japanese Cucumber Salad 3

To Make the Sunomono

  • Soak 1 Tbsp dried wakame seaweed in water and let it rehydrate for 5 minutes.
    Japanese Cucumber Salad 6
  • Meanwhile, peel the skin of 2 Japanese cucumbers, leaving some skin on to create stripes. Then, slice them thinly into rounds.
    Japanese Cucumber Salad 4
  • Sprinkle 1 tsp Diamond Crystal kosher salt on the slices and gently massage it in. Set aside for 5 minutes. The salt helps draw out the moisture from the cucumbers (so it does not dilute the salad dressing after mixing).
    Japanese Cucumber Salad 5
  • Squeeze out the liquid from the rehydrated wakame seaweed and add it to a medium bowl. 
    Japanese Cucumber Salad 6
  • Squeeze out the liquid from the cucumbers. and add them to the bowl. with the dressing and toss it all together.
    Japanese Cucumber Salad 7
  • Add ½ Tbsp toasted white sesame seeds and pour the dressing.
    Japanese Cucumber Salad 8
  • Combine everything together and serve in individual bowls or a large serving bowl.
    Japanese Cucumber Salad 9

Variations

  • Crab meat: Cut 4 pieces real or imitation crabmeat into thirds. Add to the cucumber and wakame seaweed mixture in Step 7. 
    Boiled octopus: Slice 2 oz octopus sashimi (boiled octopus) thinly. Add to the cucumber and wakame seaweed mixture in Step 7. 
    Boiled salted baby anchovies: Add 2 Tbsp shirasu (boiled salted baby anchovies) to the cucumber and wakame seaweed mixture in Step 7.
    Japanese Cucumber Salad 10

To Store

  • Keep in an airtight container and store in the refrigerator for up to 2–3 days (2 days for the seafood variations and 3 days for the classic version). However, the cucumber may release more moisture and the sauce may get diluted, so enjoy it soon!

Nutrition

Calories: 39 kcal · Carbohydrates: 5 g · Protein: 3 g · Fat: 1 g · Saturated Fat: 1 g · Polyunsaturated Fat: 1 g · Monounsaturated Fat: 1 g · Cholesterol: 11 mg · Sodium: 151 mg · Potassium: 106 mg · Fiber: 1 g · Sugar: 4 g · Vitamin A: 55 IU · Vitamin C: 2 mg · Calcium: 30 mg · Iron: 1 mg
Author: Namiko Hirasawa Chen
Course: Salad, Side Dish
Cuisine: Japanese
Keyword: cucumber salad, sunomono, wakame
©JustOneCookbook.com Content and photographs are copyright protected. Sharing of this recipe is both encouraged and appreciated. Copying and/or pasting full recipes to any website or social media is strictly prohibited. Please view my photo use policy here.
Did you make this recipe?If you made this recipe, snap a pic and hashtag it #justonecookbook! We love to see your creations on Instagram @justonecookbook!

Editor’s Note: This post was originally published on February 23, 2012. It was republished with a new video and images and more helpful information on September 22, 2023.

Introducing JOC Goods

JOC Goods, our new online shop, offering Japanese tableware and kitchenware, is now open. It is a natural extension of Just One Cookbook’s mission to teach home cooks how to prepare and enjoy delicious Japanese meals. We believe that beautifully plated food can bring joy and happiness to people’s lives.

Browse All Products

4.68 from 142 votes (122 ratings without comment)
Subscribe
Notify of
64 Comments
Inline Feedbacks
View all comments

Hands down the best sunomono I have ever made! This will be in my permanent rotation5 stars

Hi Tabby! We are so happy to hear you enjoyed Nami’s recipe.
Thank you for trying her recipe and for your kind feedback!

This is such an easy side salad to accompany any dish. I love the simplicity and the outstanding taste.5 stars

Hello Anita! We are so happy to hear you enjoyed this dish.
Thank you for trying Nami’s recipe and for your kind feedback!🤗
Happy Cooking!

Easy and fresh side dish that is perfect next to a rich curry or saute. Bonus, my kid loves it!5 stars

Hi Anna, Aww. We are so happy to hear you and your family enjoyed Nami’s recipe!
Thank you so much for your kind feedback.😊

Hello. This looks lovely. Can I ask what type of sugar you are using in the dressing? Thanks

Hi David! Thank you for trying Nami’s recipe!
Nami uses organic cane sugar (natural blond/tanned color sugar).
https://www.justonecookbook.com/faqs/
We hope this helps!

I just made this recipe with latkes and fish. It was the perfect side to balance the heaviness of the potato. Loved it!5 stars

Hi Tiffany! Thank you so much for your kind feedback!
We are glad to hear that you enjoyed Nami’s recipe. Happy Cooking!☺️

I love your recipes. I have tried your croquettes, chicken katsu with homemade katsu sauce, and this cucumber salad. My husband loved all of them. I made them couple times so far and every time it came out good (sometimes overcooked because I wasn’t careful with frying parts on my end) but still tasted great. About to make then tonight and later this week. My husband really enjoyed this salad (I make the original one without seaweed) and once the juice gets too much later, sometimes I just add more cucumbers and it works well too.5 stars

Hi Nancy! Aww. 🥰 Thank you so much for trying Nami’s recipes!
We are so happy to hear that you and your husband enjoyed many recipes from our site.
If you like Sunomono, you might also like this one. We hope you will give it a try.
https://www.justonecookbook.com/namasu-daikon-and-carrot-salad/
Happy Cooking!

I have never liked cucumber really, especially not in a salad, but wow. This was incredible! im definitely going to make more next time so i have for the next day! thank you (:5 stars

Hi Nimrod, Aww.🥰 Your comment made us so happy.
Thank you so much for trying Nami’s recipe. We hope you will also try another cucumber dish soon! 😊
https://www.justonecookbook.com/oyakodon/#search/q=cucumber

Hi Namiko! I’d like to use about 1tsp of sesame oil at sunomono. Adds lots of flavour!

Hi André Akio! Awesome! Thank you very much for trying Nami’s recipe and sharing your cooking experience!

thumbs up!5 stars

Hi Camille! We are so happy to hear you enjoyed the Sunomono!
Thank you very much for trying this recipe and for your kind feedback.😊

I used less than half the amount of sauce and slightly less sugar and they turned out great! I love all of JOC’s recipes.5 stars

Hi Christie! Thank you very much for trying JOC’s recipes and sharing your experience with us.
Happy Cooking!

A warm weather must-have! I love your variations. Mine is un-Japanesey, but I use the mandoline to slice fresh jalapeño pepper, then mix it into the cucumber. The slight peppery heat tastes great with the sweet and sour dressing.5 stars

Hi Elizabeth! Thank you very much for your kind feedback and for sharing your variations!
It sounds yummy!🤩

Delicious! I used home grown Japanese cucumbers. This is the second time I’ve made this.5 stars

Hi Leonard, Wow!🤩Home-grown cucumbers! It must be tasty!
Thank you very much for trying Nami’s recipe and for your kind feedback!

I found this recipe way too sweet, sorry.1 star

Hi Joe, Thank you very much for trying this recipe and for your feedback!
We hope you can adjust the sugar amount for your liking and enjoy the Sunomono.🙂

Love this recipe! Any issues with just rehydrating the wakame with the mixed seasoning to eliminate a step?

Hi Kody,
If you do, The color of the wakame will change and will take more longer to rehydrate.
If you want to rehydrate faster, you may use warm water. It will take only 2~3 minutes to rehydrate.
We hope this helps!

I typed this question as I was doing it, thinking I was being smart but you’re absolutely correct. It was taking forever to rehydrate with the salty vinegar solution. SCIENCE!

Hi Kody! Yes! The science behind the cooking! It’s fun!😁

How can saltiness be reduced after dish is made? I may have not measured correctly.

Hi Mitzi,
We recommend adding more sliced cucumbers or wakame and mix it well.
I hope this is helpful.🙂