📌 Marinated Cucumber, Tomato, and Onion Salad

Posted 28 March 2026 by: Admin #Various

Prep Time

15 minutes

Cook Time

0 minute

Total Time

1 hour 15 minutes

Servings

4 servings

You know that moment when you open the fridge and you have a cucumber, two tomatoes, and an onion hanging around? That’s exactly why this marinated salad exists. No fuss, no cooking — just vegetables plunged into a vinegar-oil marinade that does all the work for you.

Final result — A generous and colorful marinated salad, ideal as a side dish or a light lunch.

In the bowl, the cucumber rounds shine like glass under the clear marinade, side by side with bright red tomato slices — almost crimson in places — and onion rings that have already softened. The aroma that rises is sharp, a bit pungent, with that sweet note that tempers the acidity. The vegetables soak in a transparent and slightly oily liquid. Each bite crunches under the teeth with that tangy base that you can’t help but go back for.

Why you’ll love this recipe

✓Zero cooking, zero monitoring : The marinade does the work for you. You chop, you mix, you let it rest. That’s it.

✓It gets better with time : After a night in the fridge, it’s not quite the same salad. The vegetables have absorbed the marinade and the taste is deeper, more balanced. That’s rare for a salad.

✓Perfect with almost everything : Grilled chicken, white rice, a cold sandwich — this salad adapts effortlessly. It refreshes any meal that needs a lift.

✓Three vegetables, one basic marinade : No need for a grocery list as long as your arm. Everything is already in your fridge or cupboards.

Ingredient Notes

Ingredients

Everything you need for an express marinated salad: cucumber, tomato, onion, and a simple vinegar-oil marinade.

Cucumber : The pillar of the salad. Prefer a cucumber that feels firm to the touch — if it yields slightly, it’s already a bit old and will release too much water into the marinade. Cut it into thin slices, not thick: this is what allows the marinade to truly penetrate.
Tomatoes : No need for fancy varieties. Classic round tomatoes work just fine, provided they are ripe. A mealy, tasteless tomato won’t be saved by the marinade. In winter, cherry tomatoes hold up much better.
White onion : It brings bite and that light pungency that cuts through the sweetness of the sugar. If you find it too strong raw, soak the slices in cold water for 10 minutes beforehand: it removes the bitterness without killing its character.
Distilled white vinegar : This is what structures the entire marinade. White vinegar is the most neutral — it acidifies without adding any distracting flavors. Apple cider vinegar also works if you want a slightly fruity note.
Sugar : A quarter-cup sounds like a lot, but it’s what balances the acidity of the vinegar. The final marinade shouldn’t be sweet — it should be balanced. Taste and adjust according to your acid tolerance.

The one thing everyone rushes: the slicing

The thinness of the cut changes everything here. Thick slices of one centimeter? The marinade stays on the surface. Thin slices of 3-4 mm? It penetrates everywhere. Take a sharp knife and slice evenly. For the onions, aim for rings that are almost translucent when you hold them to the light. Slice tomatoes into rounds or half-moons if they are large. No need to peel the cucumber if the skin is thin and tender.

Why this marinade works every time

The balance is simple: water to dilute, vinegar to acidify, oil to coat, sugar to soften, salt to reveal. Mix everything in a bowl until the sugar is completely dissolved — you’ll hear the light crunch of the sugar against the bottom of the bowl for a few seconds, then it stops. That’s the signal. Pour directly over the vegetables and mix well to coat everything. The marinade should almost cover the vegetables.

What time does that you can’t do yourself

One hour minimum is what it takes for the salad to gain flavor. But overnight is where it gets really interesting. The vegetables soften slightly — they lose their rigidity without becoming mushy — and the marinade becomes less sharp, rounder. The cucumber takes on a slightly more translucent tint on the edges, a sign that the marinade has truly worked. Cover the bowl with plastic wrap and let the fridge do the rest.

Tips & Tricks

Taste the marinade before pouring it over the vegetables and adjust the acidity to your taste — some like more vinegar, others more sugar. It’s a base, not a rule set in stone.
Take the salad out of the fridge 15 minutes before serving. Cold at 4°C, it loses half its aromas — at room temperature, everything comes back.
Don’t throw away the marinade liquid at the bottom of the bowl. It can be used to deglaze a pan after cooking chicken or as a dressing base for another salad.

Close-up — The close-up of the shiny cucumber slices says it all: this salad is fresh, crunchy, and well-seasoned.

FAQs

How long can this marinated salad be stored?

It keeps for up to 3 days in the refrigerator in an airtight container. Beyond that, the vegetables become too soft and lose their texture. The first and second days are clearly the best.

Can I prepare it entirely the day before?

Yes, and it’s even recommended. Preparing the salad the day before allows the marinade to penetrate deep into the vegetables, resulting in a much more balanced and less sharp taste. Cover the bowl and leave it overnight in the fridge.

What can I use to replace distilled white vinegar?

Apple cider vinegar works very well and brings a light fruity note. Rice vinegar is milder if you prefer a less acidic marinade. Avoid balsamic vinegar — it colors everything and completely changes the flavor profile.

How do I prevent the cucumber from releasing too much water into the marinade?

After slicing the rounds, spread them out on a clean towel or paper towel and sprinkle lightly with salt. Let sit for 10 minutes, then pat off the excess water before adding to the marinade. The salad will be less diluted.

Can I add other vegetables or ingredients?

Absolutely. Thinly sliced green or red bell pepper fits in very well. Radish slices add crunch. A pinch of dried oregano or a few fresh basil leaves at serve time completely changes the atmosphere of the dish.