Creamy Japanese Potato Salad
Japanese potato salad is the side dish my family asks for whenever we grill teriyaki chicken or pack a picnic bento. It’s creamy, tangy, and dotted with crunchy cucumber and savory ham in every bite.
Unlike American potato salad, the potatoes get lightly mashed so the dressing clings to every piece, and a splash of rice vinegar keeps it from feeling heavy. This version comes together in about 35 minutes, and it tastes even better the next day.
What Makes This Japanese Potato Salad So Good
The dressing is a simple mix of Japanese mayo, rice vinegar, and a pinch of sugar, so it’s tangy and just a little sweet. You mash some of the potato into the dressing, which makes it extra creamy without drowning the chunks.
Crisp cucumber and sweet corn add freshness, while diced ham gives it savory depth. Everything stays balanced, and the longer you let it chill, the better the flavors meld.
Ingredients
- 1.5 lb (about 4 medium) waxy potatoes (Yukon Gold or red): hold their shape after boiling
- 1/2 English cucumber, thinly sliced into half-moons: salting draws out water so the salad stays creamy
- 1/2 cup corn kernels, drained if canned: adds a pop of sweetness
- 3 oz cooked ham, diced small: any deli ham works; leftover ham is great too
- 3 tbsp Japanese mayonnaise (Kewpie): the classic tangy richness; regular mayo works but you may want an extra splash of rice vinegar
- 1 tbsp rice vinegar: the mild tang that wakes up the whole dish
- 1/2 tsp sugar: just enough to balance the vinegar
- 1/4 tsp salt, plus more for the cucumber and potato water: fine sea salt is best
- Pinch of white pepper: optional, for gentle heat
Variations / Substitutions
- Ham: swap in cooked bacon, shredded chicken, or a diced hard-boiled egg for a different savory note. For a vegetarian salad, just leave it out and add an extra 1/4 cup of corn.
- Corn: frozen peas (thawed) or diced cooked carrot work nicely.
- Mayo: standard mayo (like Hellmann’s) replaces Kewpie; add 1/2 tsp extra rice vinegar and a pinch of sugar to get closer to that tangy-sweet profile.
- Spice: stir in 1 tsp Japanese karashi mustard or a tiny dab of wasabi for heat.
If you like this, try my Miso Butter Corn for another Japanese-inspired side.
How to Make Japanese Potato Salad
Step 1: Boil the Potatoes
Peel the potatoes and cut them into 1-inch cubes. Place them in a pot, cover with cold water by about 2 inches, and add a generous pinch of salt. Bring to a boil, then reduce the heat to a steady simmer and cook until a skewer slides through easily, 15 to 20 minutes.
Drain the potatoes well, then return them to the warm pot off the heat and let them steam dry for a minute. This removes extra moisture so the dressing doesn’t get watered down.
Step 2: Salt and Squeeze the Cucumber
While the potatoes cook, toss the cucumber slices with 1/2 teaspoon of salt in a bowl. Let them sit for 10 minutes; they’ll release liquid and soften slightly.
After 10 minutes, gather the cucumber in a clean kitchen towel or your hands and squeeze firmly to remove as much water as possible. This step is key for a salad that stays creamy, not watery.
Step 3: Mash and Season the Warm Potatoes
Add the hot potatoes to a large bowl. Use a fork or a potato masher to roughly mash them, leaving about half the chunks intact. You want a chunky, textured base, not a smooth puree.
While the potatoes are still steaming, stir in the 3 tbsp Japanese mayonnaise, 1 tbsp rice vinegar, 1/2 tsp sugar, 1/4 tsp salt, and the white pepper. The heat helps the dressing soak into the potatoes, making every bite creamy and well seasoned.
Step 4: Fold in the Ham, Cucumber, and Corn
Add the drained, squeezed cucumber, the diced ham, and the corn kernels to the potato mixture. Gently fold everything together with a spatula until evenly distributed.
Be careful not to overmix; you want distinct pieces of ham and cucumber visible. The salad will look a little loose at this point but will thicken as it chills.
Step 5: Spoon and Chill the Salad
Scoop the salad into a serving bowl and press a piece of plastic wrap directly against the surface, which prevents a skin from forming. Refrigerate for at least 1 hour, though overnight is even better.
When you’re ready to eat, give it a gentle stir, then top with a few extra cucumber slices or a light sprinkle of white pepper. Serve it cool, and the creamy strands of potato will cling to the crunchy bits of cucumber and ham.
Tips for the Best Japanese Potato Salad
- Dress the potatoes while they’re still hot. The mayonnaise and vinegar seep into the warm potato pieces, giving you that clingy, creamy texture.
- Leave some potato chunks intact. A mix of mashed and chunky bits gives the salad a more interesting mouthfeel.
- Make it ahead. This salad tastes even better after a night in the fridge, so it’s perfect for packing in a bento or bringing to a gathering.
- Add a dab of Japanese karashi mustard to the dressing for a subtle, wasabi-like heat that cuts through the richness.
How long to chill for the best flavor:
| Chill Time | Result |
|---|---|
| 30 minutes | Flavors just starting to meld; still tasty but looser |
| 1 hour | Good balance, cucumber still crunchy |
| Overnight | Creamy, deeply flavored, and the texture firms up perfectly |
Keeping Leftover Potato Salad Fresh
- Refrigerate: Store in an airtight container for up to 3 days. The flavors will continue to develop, so stir gently before serving.
What Goes Well With Japanese Potato Salad
A classic pairing is chicken teriyaki, where the salad’s cool creaminess cuts through the sticky-sweet glaze. It’s also great alongside crispy tonkatsu or simple grilled mackerel, balancing the hot, savory protein with something cold and tangy.
Frequently Asked Questions
Can I freeze Japanese potato salad?
No, freezing breaks down the potatoes and the dressing, leaving you with a watery, grainy mess. It’s best enjoyed fresh from the fridge.
Do I have to peel the potatoes?
Traditionally yes, but you can leave the skins on for a more rustic texture. Just make sure to scrub them well and use thin-skinned potatoes like red or Yukon Gold.
Can I add hard-boiled eggs?
Absolutely. Dice one or two hard-boiled eggs and fold them in with the ham and cucumber for extra creaminess and a richer bite.
Can I use sweet potato instead?
I wouldn’t recommend it. Sweet potatoes are too sweet and soft; they’ll turn mushy and overpower the tangy dressing. Stick with a waxy white or yellow potato for the best result.
Japanese Potato Salad Recipe
Ingredients
Method
- Peel and cube potatoes, boil in salted water until tender, about 15-20 minutes; drain and let steam dry.
- While potatoes cook, toss cucumber with 1/2 tsp salt; let sit 10 minutes, then squeeze firmly to remove water.
- In a bowl, roughly mash the hot potatoes, then stir in mayo, rice vinegar, sugar, salt, and white pepper until creamy with some chunks.
- Gently fold in cucumber, ham, and corn.
- Spoon into a serving bowl, cover with plastic wrap, and refrigerate at least 1 hour. Garnish with extra cucumber slices and serve chilled.
