Japanese Potato Salad With Cucumbers, Carrots, and Red Onion Recipe

A unique take on the classic flavor with tangy mayo, rice vinegar, and hot mustard.

Japanese potato salad in a white serving dish on a wooden outdoor table.
It may look like American potato salad, but wait until you taste it...

Serious Eats / Shao Z.

Why It Works

  • Starting the potatoes in cold water allows them to heat up along with the water, resulting in a more even doneness throughout.
  • Seasoning the cooking water allows the potatoes to be better flavored all the way to the core.

One summer during college I was fortunate to spend three months in Japan traveling and eating my way around the country. Naming a favorite meal during my stay there would be impossible—there were just too many unforgettable dishes and restaurants. But if there was one overall type of Japanese food that I enjoyed the most, it would have to be yōshoku cuisine, which is Western food done Japanese-style.

One of the most popular yōshoku dishes, and one that can be easily made at home, is Japanese potato salad. When you compare the ingredient list of the Japanese version and the Western version, the ingredients are pretty similar. That's how most yōshoku dishes are—ingredient-wise, they look pretty much the same as the originals that inspired them. But they're almost always different in one way or another. In the case of the potato salad, the biggest difference is the texture, because in the Japanese version, they're always mashed. It also tends to include a wider variety of vegetables than you'd see in a typical American potato salad, including cucumber, carrots, and corn; sometimes there's even ham mixed in.

Mayonnaise is a key ingredient in both versions, but for the yōshoku one, Japanese-style mayonnaise, such as Kewpie, is the mayo of choice for its extra creaminess and sweetness. You can find it at most Asian supermarkets, and I've noticed more and more Western supermarkets carrying it as well, but if for some reason you can't track it down, it's easy enough to make at home. For the salad, it's mixed with rice vinegar and Japanese hot mustard. The rice vinegar adds even more tang to the dressing while helping to thin out the mayonnaise so it can be more easily mixed with the potatoes.

While Japanese-style mayonnaise plays an important role in this dish, you can't have potato salad without potatoes. The first step is to boil them, and there is a right and wrong way to do it. First, always start the potatoes in cold water. This allows them to heat up as the water does, resulting in more even cooking throughout. Second, it's important to season the cooking water so that the potatoes can absorb it well.

Several chunks of carrot that have been quartered lengthwise pictured on a cutting board, as well as a pile of thinly-sliced carrot quarter-moons.

Serious Eats / Shao Z.

Next come the other salad ingredients. For this version, I'm keeping it simple with cucumbers, carrots, onions, eggs, and scallions, though there are plenty of Japanese potato salads that go well beyond this. To prevent a watery salad, I thinly slice the cucumbers and season them with salt to draw out excess water before combining them with the other ingredients.

A bowl of cooked potatoes being broken apart and roughly mashed up into irregular chunks with a slotted spoon.

Serious Eats / Shao Z.

The last step is to gently mash the potatoes, leaving small chunks behind for texture, and then mix it all together.

The potato salad, fully assembled in a mixing bowl, with a slotted spoon scooping into the mixture.

Serious Eats / Shao Z.

It may look like your run-of-the-mill American potato salad, but the flavor is 100% Japanese.

June 2015

Recipe Facts

Prep: 5 mins
Cook: 25 mins
Active: 30 mins
Total: 30 mins
Serves: 6 to 8 servings

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Ingredients

  • 1 1/2 pounds russet potatoes, about 2 to 3 large potatoes, peeled and quartered

  • Kosher salt

  • 2 Persian cucumbers (4.4 ounces; 125g), thinly sliced crosswise

  • 2 teaspoons rice wine vinegar

  • 6 tablespoons homemade or store-bought Japanese mayonnaise (3 ounces; 85g), such as Kewpie

  • 1/2 teaspoon Japanese hot mustard

  • 1 small carrot (2 ounces; 55g), quartered and thinly sliced crosswise

  • 1/4 red onion (2 ounces; 55g), thinly sliced

  • 2 hard boiled eggs, peeled and chopped

  • 1 scallion, white and light green parts only, chopped

Directions

  1. Place potatoes in a large pot and add enough cold water to cover by 1 inch. Season generously with salt and bring to a boil over high heat. Reduce to a simmer and cook until potatoes are easily pierced with a fork, 10 to 15 minutes. Drain potatoes and transfer to a large bowl. Let cool.

  2. Meanwhile, place cucumbers in a bowl and sprinkle 1/2 teaspoon salt. Mix well, then let stand for 10 minutes. Drain any accumulated water, then gently squeeze cucumbers with paper towels to blot up any excess liquid.

    A measuring spoon of salt being sprinkled over a a bowl of sliced cucumber.

    Serious Eats / Shao Z.

  3. In a small bowl, whisk together rice vinegar, mayonnaise, and hot mustard until well combined.

  4. Mash potatoes with a masher or a large fork, allowing some small lumps to remain. Add cucumbers, carrots, onions, eggs, scallions, and mayonnaise mixture. Mix well and season with salt to taste. Serve right away. The salad can be refrigerated up to 1 day.

    Thinly-sliced red onions, carrots, and cucumbers piled on top of a bowl of roughly mashed potatoes, ready to be mixed in with a spoon. An open bottle of kewpie mayonnaise and a tube of hot mustard are partially visible on the countertop next to the bowl.

    Serious Eats / Shao Z.

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Nutrition Facts (per serving)
179 Calories
9g Fat
20g Carbs
4g Protein
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Nutrition Facts
Servings: 6 to 8
Amount per serving
Calories 179
% Daily Value*
Total Fat 9g 12%
Saturated Fat 2g 8%
Cholesterol 51mg 17%
Sodium 179mg 8%
Total Carbohydrate 20g 7%
Dietary Fiber 2g 8%
Total Sugars 2g
Protein 4g
Vitamin C 8mg 41%
Calcium 29mg 2%
Iron 1mg 7%
Potassium 537mg 11%
*The % Daily Value (DV) tells you how much a nutrient in a food serving contributes to a daily diet. 2,000 calories a day is used for general nutrition advice.
(Nutrition information is calculated using an ingredient database and should be considered an estimate.)