Classic Marinated Cucumber, Tomato, and Onion Salad

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Right off the bat, this salad checks all the boxes: quick, no-fuss, and totally delicious. Thinly sliced cucumbers, juicy tomatoes, and sweet red onions are bathed in a tangy, herb-infused marinade that brings every bite to life. It’s fresh, it’s zippy, and it’s perfect for just about any meal — from backyard BBQs to light lunches and everything in between.

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What Is Classic Marinated Cucumber, Tomato, and Onion Salad?

This vibrant salad is a celebration of summer produce, tossed in a simple marinade made of vinegar, olive oil, and herbs. It’s a dish that’s been gracing tables for generations — a classic, through and through — and for good reason! The vegetables stay crisp, the flavor deepens over time, and it pairs beautifully with just about any main course.

Even though it’s called a salad, don’t expect lettuce here. This is all about bold, clean flavors that only get better with a little time in the fridge.

Why You’ll Love This Recipe

No cooking required – Hello, heat-free meals!
Make-ahead friendly – The flavors only get better after marinating.
Crisp, tangy, and refreshing – Perfect for hot weather or anytime you want something light.
Versatile side dish – Works with everything from grilled meats to sandwiches.
Naturally gluten-free and low-carb – A healthy choice without any effort.

What It Tastes Like

Every bite is a balance of textures and flavors. The cucumbers stay delightfully crisp, the tomatoes are sweet and juicy, and the onions become mellow and tangy after soaking in the marinade. The vinegar adds brightness, while the olive oil brings a silky richness that pulls it all together. A pinch of sugar helps round out the acidity, and the oregano adds that comforting, familiar herbal note.

Honestly? It tastes like summer in a bowl.

Benefits of This Marinated Salad

Not only is this salad delicious, but it’s also packed with nutritional perks:

Hydrating: Thanks to high water content in cucumbers and tomatoes.
Antioxidants: Tomatoes are rich in lycopene and vitamin C.
Digestive support: Vinegar can help with digestion and blood sugar balance.
Heart-healthy: Olive oil brings in those good-for-you monounsaturated fats.

Ingredients

2 large cucumbers, thinly sliced
3 medium tomatoes, cut into wedges or thick slices
1 medium red onion, thinly sliced
1/4 cup white vinegar (or apple cider vinegar)
3 tbsp olive oil
1 tbsp granulated sugar (optional, for a touch of sweetness)
1 tsp salt
1/2 tsp black pepper
1 tsp dried oregano (or Italian seasoning)
1/4 cup fresh parsley, chopped (optional, for garnish)

Tools You’ll Need

Large mixing bowl
Small bowl or measuring cup
Whisk or fork for mixing marinade
Sharp knife or mandoline slicer
Cutting board
Plastic wrap or airtight container (for marinating)

Ingredient Substitutions & Additions

This recipe is super flexible — here are a few ways to make it your own:

Swap the vinegar: Try red wine vinegar, apple cider vinegar, or rice vinegar.
Change the herb: Oregano is classic, but dill, basil, or thyme would also be lovely.
Add-ins:

• Crumbled feta cheese
• Sliced kalamata or green olives
• Avocado (add just before serving)
• Sliced bell peppers or radishes for extra crunch
• A handful of chickpeas or white beans for added protein

I promised you versatile — and here’s the proof!

How to Make Classic Marinated Cucumber, Tomato, and Onion Salad

1. Prepare the Vegetables

In a large bowl, combine the sliced cucumbers, tomatoes, and onions.

2. Make the Marinade

In a small bowl, whisk together the vinegar, olive oil, sugar (if using), salt, black pepper, and oregano. Taste and adjust seasoning as needed.

3. Toss the Salad

Pour the marinade over the vegetables. Toss thoroughly to ensure all pieces are well coated.

4. Let It Marinate

Cover the bowl with plastic wrap or transfer to an airtight container. Refrigerate for at least 1 hour — or up to 24 hours — to let the flavors develop.

5. Garnish and Serve

Just before serving, toss the salad again and sprinkle with fresh parsley if using. Serve cold or at room temperature.

What to Serve It With

This salad is a perfect companion for just about anything on the table:

Grilled meats like chicken, steak, or pork
Barbecued ribs or burgers
Roasted fish or baked salmon
Mediterranean mains like gyros, falafel, or hummus plates
Sandwiches and wraps — adds a crisp contrast
Or simply serve it with some crusty bread and call it lunch!

Tips for the Best Results

Use ripe, in-season tomatoes for maximum flavor and sweetness
Slice everything evenly so the marinade coats everything uniformly
Let it chill long enough — even 1 hour makes a big difference
Don’t skip the salt — it draws out moisture from the veggies, helping them absorb the marinade
Double the recipe if you’re feeding a crowd — it disappears fast!

Storage Instructions

Store any leftovers in an airtight container in the refrigerator for up to 3 days. The vegetables will soften over time, but the flavors will continue to deepen. If needed, give it a quick toss and a splash of fresh vinegar before serving again.

Frequently Asked Questions

Can I make this ahead of time?

Absolutely! In fact, it’s better when made a few hours or a day in advance.

Can I use cherry tomatoes instead of slicing tomatoes?

Yes! Cherry or grape tomatoes are great — just halve them before mixing in.

Is there a sugar-free option?

You can leave out the sugar entirely or substitute with a drizzle of honey or maple syrup for a natural touch of sweetness.

Can I freeze this salad?

Nope — cucumbers and tomatoes don’t freeze well. It’s best enjoyed fresh!

In Conclusion

This Classic Marinated Cucumber, Tomato, and Onion Salad is everything a salad should be — simple, satisfying, and seriously flavorful. With just a few fresh ingredients and a no-cook marinade, you’ll have a side dish that’s anything but boring!! Whether you’re cooking for a crowd or just making a quick lunch, this is one of those recipes that always delivers.

🥒🍅🧅 Have you tried it? Leave a review and share your photo on Pinterest! I love seeing your creations and hearing how you serve it up.

Craving More Fresh and Flavorful Recipes?

If you loved this one, try these next:

Peach Caprese Salad – Fresh peaches, basil, and mozzarella in a balsamic drizzle
Grilled Peach and Arugula Salad – Peppery greens with sweet grilled stone fruit
Cucumber and Watermelon Salad – A summer classic with mint and lime

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