10-Minute Mentaiko Cucumber Salad: The Ultimate No-Cook Japanese Side

Refreshing 10-minute Mentaiko Marinated Cucumber, a no-cook Japanese side dish.
Crisp cucumber with spicy mentaiko, a perfect Japanese side for summer

Some days it’s not that you don’t want to cook; you just can’t stand battling oil splatters and heat in a kitchen that’s pushing 90°F (32°C). In the sweltering summer, you simply don’t have the energy — and the last thing you want after eating is a pile of greasy pots and dishes to wash.

But you still need to eat. As they say, a well-fed stomach keeps you feeling young. So you peek in the fridge and wonder: is there something light, cool, and easy you can toss together that doesn’t need a hot stove? One less stir-fry is one less reason to sweat.

And there it is, tucked in the corner: that everyday cucumber you always grab at the market. Nothing fancy — just a humble, budget-friendly cucumber waiting to be turned into a quick Japanese home-style side dish.

Give it a quick rinse, sprinkle with a bit of salt, and gently rub the skin with salt, almost like giving it a quick scrub. Rinse off the salt, slice it into bite-sized pieces, then add another pinch of salt to draw out excess moisture — even the cucumber has to sweat in this heat! :)

Slice it like a book (accordion cut) for extra crunch and flavor.
Cut it like pages in a book (accordion cut) so the marinade soaks in — extra crunchy and flavorful.

Next comes the seasoning: a pinch of shio kombu (salted seasoned kelp), a spoonful of mentaiko (spicy cod roe), and a drizzle of toasted sesame oil. Nothing overwhelms; every bite is perfectly balanced. It’s not the kind of taste that shouts, but the kind that makes you think, “Hmm, this works so well together.”

Mentaiko Marinated Cucumber isn’t a flashy Michelin dish — it’s real, savory, and refreshingly crisp; exactly the kind of Japanese side dish that cools you down on a sweltering day.

That’s it. Just toss it together, let it rest in the fridge for about 20 minutes, and it’s ready to enjoy.

There's no need for a special occasion or a good mood; when it’s this hot out, you just want something fresh and easy. This simple cucumber dish does its job perfectly.

If you have a cucumber waiting in the fridge, give it a try!


Mentaiko Marinated Cucumber (10-Minute No-Cook Japanese Side)

Ingredients

📍Serves about 1–2 people
Shio kombu and mentaiko are available at most Asian grocery stores or Japanese markets.

  • 1 cucumber
  • A pinch of salt (for drawing out excess moisture)
  • A pinch of shio kombu (salted seasoned kelp)
  • ½ teaspoon toasted sesame oil
  • 1 tablespoon mentaiko (spicy cod roe, membrane removed; about one roe sac)
  • Extra salt to taste (optional)

How to Make It

Use a spoon to scrape the cod roe from its casing
Remove the mentaiko membrane and scrape out the roe with a spoon.
  1. Prepare the mentaiko: Use a spoon to remove the membrane and gently scrape out the roe. Set aside.
  2. Prepare the cucumber: Lay the cucumber flat and place a chopstick on each side to prevent cutting all the way through. Slice crosswise at about 1/16 inch (2mm) intervals. Flip it over and repeat to create a crisscross “book” cut (accordion cut) so the marinade can soak in evenly.
  3. Cut & sweat: Chop the cucumber into bite-sized pieces about ¾ inch (2cm) long. Sprinkle with a pinch of salt and let it sit for 10 minutes to draw out excess moisture.
  4. Rinse & gently squeeze: Rinse off the salt and lightly squeeze out excess moisture — be careful not to crush the cucumber.
  5. Season & mix: Add the shio kombu, sesame oil, and prepared mentaiko. Mix gently until evenly coated. Taste and adjust with a little extra salt if needed.
  6. Chill: Transfer to a container and refrigerate for about 20 minutes to allow the flavors to meld. Serve cold.

📍Tips

  • If you don’t have shio kombu, substitute with a small splash of light soy sauce and a sprinkle of bonito flakes (katsuobushi).
  • For extra heat, add a few drops of chili oil when mixing.
  • Storage: Best enjoyed the same day for maximum crunch, but it can be stored in the refrigerator for up to 2 days.
  • Make-ahead tip: If preparing in advance, salt the cucumber just before serving to keep it crisp.