Japanese Potato Salad (Poteto Sarada)

Method

1. Boil the potatoes in salted water until fork-tender, about 12-15 minutes. The potatoes should break apart easily when pierced but not be waterlogged. Drain thoroughly and return to the hot pot for 30 seconds to evaporate excess moisture — wet potatoes make a soggy salad.

2. While the potatoes cook, salt the cucumber. Toss the thin cucumber slices with 1/2 tsp salt in a bowl and let sit for 10 minutes. The salt draws out moisture through osmosis. After 10 minutes, squeeze the cucumber slices firmly in your hands to wring out as much water as possible. This step is essential — skip it and the salad turns watery within an hour.

3. Mash the hot potatoes roughly with a fork or masher. You want a mix of smooth and chunky — about 60% mashed, 40% small chunks. While still warm, add the rice vinegar and sugar. Warm potatoes absorb seasoning better than cold ones — this is the same principle behind dressing pasta salad while the pasta is hot.

4. Let the potatoes cool to room temperature, about 10 minutes. Adding mayo to hot potatoes will cause it to separate and become oily. Patience here pays off.

5. Fold in the Kewpie mayo, salt, and white pepper. Then gently fold in the squeezed cucumber, soaked and drained onion, ham strips, blanched carrot, and chopped egg. Mix gently — you want to preserve the chunky texture, not create a paste.

6. Taste and adjust. It should be creamy, slightly tangy from the rice vinegar, with a gentle sweetness. Add more mayo if it seems dry, more vinegar if it needs brightness.

7. Refrigerate for at least 30 minutes before serving. Japanese potato salad is served as a side dish at izakayas, in bento boxes, and at convenience stores across Japan. It pairs beautifully with any Japanese main — teriyaki, tonkatsu, or grilled fish.

Equipment

• Medium saucepan Recommended: Cuisinart Chef's Classic 3-Quart Saucepan
• Potato masher or fork Recommended: OXO Good Grips Stainless Steel Potato Masher
• Mixing bowls Recommended: Vollrath Stainless Steel Mixing Bowls Set

Chef Notes

• The most important thing: Kewpie mayo is non-negotiable. It's made with egg yolks only (no whites), rice vinegar, and MSG — it's richer, tangier, and more umami-forward than American mayo. Available at most Asian grocery stores and Amazon.
• Mash the potatoes while hot but leave them chunky — about 60% mashed, 40% chunks. This dual texture is what makes Japanese potato salad distinct from the American version.
• Salt the cucumber slices and let them sit for 10 minutes, then squeeze out the water. This prevents the salad from getting watery.
• Soak the sliced onion in cold water for 5 minutes to mellow its bite. Drain and squeeze dry.
• This salad is best served slightly chilled, not ice cold. Let it sit at room temperature for 10 minutes after refrigerating.

Common Substitutions

Ingredient	Substitution	Notes
Kewpie mayo	Regular mayo + pinch of sugar + dash of rice vinegar	Approximates the flavor but lacks the richness of egg-yolk-only mayo
Ham	Imitation crab, corn kernels, or omit	Corn is a popular variation in Japan
Yukon Gold	Russet potatoes	Russets are starchier and mash more completely — less chunky texture
Rice vinegar	Apple cider vinegar	Slightly fruitier but works well

What You're Practicing

This recipe teaches the principle of seasoning at the right temperature — adding vinegar to hot potatoes so they absorb it, but waiting for them to cool before adding mayo so it doesn't break. This temperature-awareness applies to any composed salad: pasta salad, grain bowls, bean salads. Visit Techniques for more on building composed dishes.

The cucumber salting technique (drawing out moisture with salt) is a fundamental prep skill used across cuisines — from Greek tzatziki to Korean oi-sobagi to Middle Eastern fattoush. Once you understand osmosis in the kitchen, you'll never serve a watery salad again.