Japanese home-style potato salad is chunkier and creamier than the American deli version, with thin-sliced cucumber, carrot, and onion folded into mashed potato and a mayo-based dressing. It comes together in 30 minutes and works as a filling side alongside grilled meat, fish, or eggs โ substantial enough to anchor a light meal on its own.
Why this recipe works
Two things make this salad hold together well. First, the potatoes are boiled with the skin on, which keeps them from absorbing water and turning the finished salad loose and wet. Peeling after cooking โ while theyโre still hot โ takes about 30 seconds and pays off in a denser, starchier mash that actually grips the dressing. Second, the cucumber and onion are salted and left to wilt before being added. That step draws out excess moisture so it doesnโt pool at the bottom of the bowl later. Skipping either step is the main reason this salad ends up watery.
Substitutions that actually work
- Japanese cucumbers: Persian cucumbers are the best substitute โ thin skin, low seed count, similar texture. English cucumber works too; just halve it lengthwise and scrape out the seeds before slicing. Standard American cucumbers have too much water and too thick a skin.
- French dressing (salad dressing): This is the bottled, slightly sweet American-style French dressing, not a vinaigrette. Thousand Island dressing is a reasonable swap. If you skip it entirely, add a small splash of rice vinegar to the mayo to keep the flavor from going flat.
- Mayonnaise: Japanese mayonnaise (Kewpie) is richer and slightly tangier than standard American mayo and will noticeably improve the dressing if you can find it. Itโs worth seeking out.
Mistakes to avoid
- Not drying the vegetables thoroughly: After rinsing the salted cucumber and onion, squeeze them firmly in a clean kitchen towel. Patting alone leaves too much surface water, which thins the dressing and makes the salad sloppy by the time it reaches the table.
- Over-mashing the potatoes: The recipe calls for squishing with a spatula, not a full mash. You want some texture โ small chunks are fine. A completely smooth mash turns gluey once the mayo goes in.
- Adding mayo to hot potatoes: Let the potatoes cool for at least 10 minutes after mashing. Hot potato breaks down the emulsion in the mayo, making the dressing greasy rather than creamy.
- Under-seasoning: Between the salting steps, itโs easy to assume the dish has enough salt. Taste the finished salad before serving โ the potato base absorbs a lot and often needs a small pinch more at the end.
- Dress it at the table โ a pre-dressed salad goes limp fast. If youโre making this ahead, keep the mayo dressing separate and fold it in just before serving.
Make-ahead notes
You can prep every component up to a day ahead. Store the mashed potato base, the dried cucumber-onion mixture, and the blanched carrot separately in the fridge, covered. The dressing โ mayo, French dressing, and sugar โ can be mixed and refrigerated in a small jar. Combine everything and fold in the dressing no more than an hour before serving. Once dressed, the salad keeps in the fridge for up to two days, but the cucumber softens noticeably after the first day. If youโre planning leftovers, hold back half the cucumber and stir it in fresh when you serve the second portion.
Japanese Potato Salad: Creamy Home-Style Recipe
Equipment
- Large saucepan
- Large mixing bowl
- Vegetable peeler
- Sharp knife or mandoline
- Food processor with slicing disc (optional)
- Clean kitchen towel or cheesecloth
- Spatula or potato masher
Ingredients
- 2 large potatoes about 1 lb / 450g total, such as Yukon Gold or May Queen
- 1 teaspoon salt plus more for boiling water
- 2 medium Japanese cucumbers about 7 oz / 200g total, or 1 regular cucumber, or ยฝ English cucumber
- 1 medium carrot about 3 oz / 80g
- ยผ medium yellow onion about 2 oz / 55g
- ยฝ cup mayonnaise 8 tablespoons / 120g, preferably Kewpie
- 3 tablespoons French dressing or substitute 1 tablespoon rice vinegar + ยฝ teaspoon Dijon mustard for a more traditional flavour
- 1 tablespoon granulated sugar 12g
- 1 teaspoon dry mustard optional, for a more adult flavour โ start with ยฝ teaspoon and adjust to taste
Instructions
- Wash the potatoes and cut out any eyes or blemishes. Place them whole and unpeeled in a large saucepan, cover with cold salted water by about 1 inch, and bring to a boil over high heat. Reduce to a steady simmer and cook for 25-30 minutes, or until a knife slides easily into the centre with no resistance.2 large potatoes, 1 teaspoon salt
- When a knife or skewer slides easily into the centre of the largest potato, drain the water and let the potatoes sit in the hot pan for 1-2 minutes to steam dry. While still hot, peel the skin using a towel to protect your hands โ it should slip off easily. Cut the potatoes into rough quarters.2 large potatoes
- Transfer the hot potato quarters to a large mixing bowl. Use a spatula or potato masher to roughly mash โ leave some chunks for texture, about one-third should remain in small pieces. While the potatoes are still warm, sprinkle over the sugar and drizzle in the French dressing. Fold gently to combine. The warm potato absorbs the seasoning much better than cold.2 large potatoes, 3 tablespoons French dressing, 1 tablespoon granulated sugar
- Slice the cucumbers into thin rounds, about 2mm thick โ a food processor with a slicing disc or a mandoline makes quick work of this. Place in a bowl, sprinkle with ยฝ teaspoon salt, toss to coat, and leave to wilt for 10 minutes.2 medium Japanese cucumbers, 1 teaspoon salt
- Slice the carrot into thin rounds, about 2mm thick. Blanch in boiling water for 60-90 seconds until just barely tender but still crunchy, then immediately transfer to a bowl of ice water to stop cooking. Drain and set aside. Slice the onion paper-thin (a food processor or mandoline helps). Place the sliced onion in a bowl of cold salted water and soak for 5 minutes to remove the harsh raw bite. Squeeze the wilted cucumber firmly in a clean kitchen towel or cheesecloth to wring out as much moisture as possible. Drain the onion, rinse briefly under cold water, and squeeze dry in the same towel.1 medium carrot, 1/4 medium yellow onion, 2 medium Japanese cucumbers, 1 teaspoon salt
- Add the squeezed cucumber, blanched carrot, and drained onion to the mashed potato. Add the mayonnaise and fold everything together gently with a spatula until evenly combined โ avoid over-mixing or the salad will become gluey. Taste and adjust mayo to your preference. For a sharper, more adult flavour, stir in 1 teaspoon of dry mustard (start with ยฝ teaspoon and adjust to taste). Cover and refrigerate for at least 30 minutes before serving to let the flavours meld.2 medium Japanese cucumbers, 1 medium carrot, 1/4 medium yellow onion, 1/2 cup mayonnaise, 1 teaspoon dry mustard
Notes
Nutrition
Common questions
Can I add protein to make this a more complete meal?
Yes โ sliced hard-boiled eggs or diced ham are the most common additions in Japanese home cooking. Fold them in gently at the end so they donโt break up into the potato base.
What kind of potatoes work best here?
Waxy potatoes like Yukon Gold hold their shape better than russets and give a creamier texture when partially mashed. Russets work but tend to go fluffy and can make the salad feel heavier.
Do I have to use both mayonnaise and French dressing, or can I just use one?
The mayo is essential โ itโs the base of the dressing. The French dressing adds a mild sweetness and slight tang that balances the richness; without it, the salad tastes a little flat. If you skip it, add a teaspoon of rice vinegar and a small pinch of sugar instead.
How do I know when the carrots are blanched enough?
Drop the sliced rounds into boiling water for 60 to 90 seconds, then transfer immediately to cold water. They should bend slightly without snapping but still have a firm bite โ not crunchy-raw, not soft.
The recipe serves 2 โ how do I scale it up for a group?
It scales straightforwardly: double or triple all ingredients proportionally. The one thing to watch is the mayo โ start with slightly less than the scaled amount and adjust to taste, since a large batch can end up over-dressed if you add it all at once.
Can I make this without the sugar?
You can, but the salad will taste noticeably sharper. The sugar is a small amount and its job is to round out the acidity from the dressing, not to make the salad sweet. A half-teaspoon of honey is a reasonable substitute if you prefer.