Cucumber Tomato Onion Salad: Easy No-Cook Recipe

It’s 90 degrees outside, and turning on the stove is the last thing you want to do. This is exactly the moment a cucumber tomato onion salad earns its spot at the table. Many people don’t realize how often the simplest recipes get overlooked, buried under trendy diets and complicated meal plans. But this one has stuck around for a reason: it takes about fifteen minutes, needs zero cooking, and turns three humble vegetables into something genuinely craveable.

The tricky part isn’t the recipe, it’s timing. Cut the vegetables too early, or add the dressing too soon, and you get a watery mess instead of the crisp, tangy salad you were picturing. Below, you’ll learn how to build it the right way, keep it crisp for hours, and shape it around whatever eating style you follow.

What Is Cucumber Tomato Onion Salad?

At its core, this is about as simple as cooking gets, minus the cooking. Crisp cucumber, juicy tomato, and sharp onion are sliced thin, then tossed with a light dressing of olive oil, vinegar, salt, and pepper. Some versions add fresh herbs like basil or dill; others lean Mediterranean with feta and oregano. What makes it work isn’t a secret ingredient. It’s the contrast: cool cucumber, sweet-tart tomato, and a slight bite of raw onion, pulled together with a tangy dressing.

Why you’ll love it:

• Ready in about 15 minutes, no stove required
• Made from simple, affordable produce most grocery stores carry year-round
• Naturally low in calories, with no processed ingredients
• Works as a side dish, light lunch, or meal-prep base
• Easy to adjust for different diets, from Mediterranean-style to low-carb

Ingredients You’ll Need

You only need a handful of ingredients, and most are probably already on your list.

• 2 medium cucumbers (English or Persian work best)
• 2–3 medium tomatoes, or 1 pint cherry tomatoes, halved
• ½ medium red onion, thinly sliced
• 2–3 tablespoons olive oil
• 1–2 tablespoons vinegar (red wine, apple cider, or white) or fresh lemon juice
• Salt and black pepper, to taste
• Optional: fresh basil, parsley, or dill

Best Cucumbers to Use

English cucumbers are the easiest choice: thin skin, fewer seeds, less water content than regular slicing cucumbers. Persian cucumbers work just as well and are a bit sweeter. With a standard cucumber, peel it if the skin tastes bitter and scoop out large seeds, since seedy centers release more liquid.

Best Tomatoes to Use

Ripe, in-season tomatoes make the biggest difference here. Roma tomatoes hold their shape and have fewer watery seeds. Cherry or grape tomatoes are a reliable year-round option since they stay firm outside peak summer. Skip anything that feels mushy or soft.

Choosing the Right Onion

Red onion is the classic pick, with a milder bite than white or yellow onion and a nice pop of color. If raw onion is too sharp for your taste, soak the sliced pieces in cold water for about 10 minutes. This softens the flavor without losing the crunch.

Why Cucumber Tomato Salad Turns Watery (And How to Stop It)

This is the most common complaint about this dish, for a simple reason: cucumbers and tomatoes are both roughly 90 to 95 percent water. Once sliced, that water starts to escape, especially once salt is added, since salt draws moisture out of vegetables.

The fix: salt your cucumber slices about 10 to 15 minutes before assembling, then drain off whatever liquid collects. This removes excess water upfront and seasons the cucumber from the inside out. If you’re prepping a big batch for a potluck, or building this into a salad meal prep routine, this step matters even more. And don’t add the dressing until you’re close to serving; added too early, it speeds up water loss and softens everything faster than you’d like.

How to Make Cucumber Tomato Onion Salad

Here’s the version we make when we want something reliable and ready in one bowl.

1. Prepare the Vegetables

Slice the cucumbers into thin rounds or half-moons. Halve or quarter the tomatoes. Thinly slice the red onion. Salt the cucumber slices lightly, let them sit in a colander for 10 minutes, then pat dry with a paper towel.

2. Make the Dressing

Whisk together olive oil, vinegar or lemon juice, a pinch of salt, and black pepper. A rough ratio of 3 parts oil to 1 part acid works for most palates, but adjust based on how tangy you like things.

3. Toss the Salad

Combine the cucumber, tomato, and onion in a large bowl. Pour the dressing over the top and toss gently, folding in fresh herbs now if you’re using them.

4. Chill and Serve

Refrigerate for at least 10 minutes before serving. This lets the flavors come together without letting the vegetables sit in dressing long enough to turn mushy.

The Best Dressing for Cucumber Tomato Onion Salad

A classic olive oil and vinegar dressing is hard to beat, but there’s room to play. Apple cider vinegar adds a fruity tang, red wine vinegar leans savory, and fresh lemon juice keeps things bright. Some people whisk in a spoonful of Greek yogurt for a creamier texture without a heavy, ranch-style feel. If you’re eating Mediterranean-style, this salad fits right in among Mediterranean diet dinner ideas, which almost always include a fresh, vinegar-forward salad alongside a grilled protein.

Easy Variations

Once you’ve got the base recipe down, it’s easy to switch things up.

With Feta

Crumble in about ½ cup of feta for a salty, tangy edge that pairs well with a lemon-based dressing.

Mediterranean Style

Add kalamata olives, a sprinkle of dried oregano, and swap in red wine vinegar. It pairs nicely with a bigger, grain-based meal, like a Mediterranean quinoa salad.

With Fresh Herbs

Dill, basil, or parsley add brightness with almost no extra calories. Add them right before serving so they stay vibrant.

Spicy Version

A pinch of red pepper flakes or a few thin slices of jalapeño adds heat, especially good next to grilled meats.

Common Mistakes to Avoid

• Skipping the salting step, leading to a watery salad
• Adding the dressing too far ahead of serving
• Using tomatoes that aren’t fully ripe
• Slicing the onion too thick, so it overpowers everything else
• Storing leftovers already dressed, which speeds up sogginess

Expert Tips From the EatLikeFit Kitchen

At EatLikeFit, we often recommend simple habits before anything fancy, and this recipe is a good example.

• Salt the cucumbers separately, then pat dry before mixing everything together
• Keep a jar of pre-made vinaigrette in the fridge so this comes together any night
• Taste before serving, since vinegar and salt levels vary by brand
• If serving a crowd, keep the vegetables and dressing separate until guests arrive

Is Cucumber Tomato Onion Salad Healthy?

Generally, yes. This salad is built almost entirely from fresh vegetables, naturally low in calories and free of added sugar or heavily processed ingredients. Cucumbers are mostly water, which may help support hydration, especially in warm weather. Tomatoes are a source of vitamin C and lycopene, an antioxidant research suggests is associated with several health benefits. Onions bring fiber and plant compounds often discussed in the context of heart health.

Together, these ingredients line up well with a Mediterranean-style pattern of eating, which the: Academy of Nutrition and Dietetics] and other major health groups often highlight as sustainable. That said, one salad doesn’t define a diet; the pattern over time matters most. For more staying power, pair it with a protein like grilled chicken, beans, or a hard-boiled egg.

Who can benefit most:

• People trying to eat more vegetables with little effort
• Anyone focused on weight management, since it’s low-calorie and high-volume, similar to other high-volume, low-calorie foods
• Those following a Mediterranean-style or plant-forward diet
• Anyone wanting a refreshing side dish in hot weather

When to Seek Medical Advice

For most healthy adults, this salad is a low-risk addition to a balanced diet. Raw onion can trigger bloating in people sensitive to certain fermentable carbs, sometimes called FODMAPs; our guide to foods that reduce bloating naturally covers a few swaps that may help. People managing kidney conditions are sometimes advised to watch potassium intake, and both tomatoes and cucumbers contain potassium, so check with a doctor or dietitian about portion sizes if this applies to you.

This article is meant to inform, not replace personalized medical advice. If you have a chronic condition, check with a healthcare provider before making major dietary changes.

Practical Daily Habits to Make This Salad a Regular Thing

One small habit can make a big difference over time:

1. Wash and slice cucumbers and onion in advance, storing them separately from tomatoes
2. Keep a simple vinaigrette pre-made in a jar in the fridge
3. Add this salad to your rotation alongside grilled proteins a few times a week
4. Prep a bigger batch of undressed vegetables on Sunday, then dress portions through the week

What to Serve With Cucumber Tomato Onion Salad

This salad pairs well with almost anything off the grill:

• Grilled chicken, steak, or fish
• Burgers or sandwiches at a cookout
• Grain bowls, similar to a sweet potato brown rice salad
• Other cookout sides, like easy coleslaw or a classic potato salad

Cucumber Tomato Onion Salad Nutrition

Estimates will vary depending on the ratio of vegetables, dressing amount, and added salt. For a precise breakdown based on your own ingredients, a recipe conversion calculator can help.

Storage & Make-Ahead Tips

• Undressed vegetables: Store separately in airtight containers for up to 3 days
• Dressed salad: Best eaten within 24 hours, after which vegetables soften
• Make-ahead tip: Prep vegetables and dressing separately, then combine before serving
• Freezing: Not recommended; high water content turns them mushy once thawed

Helpful EatLikeFit Tools

A few free tools on our site can make cooking and meal planning a little easier:

• Recipe Converter Calculator: Scale this recipe up for a bigger cookout, or down to a single serving, without doing the math by hand
• Recipe Cost Calculator: Estimate what a dish will cost before your grocery run
• Reverse BMI Calculator: A starting point if this salad is part of a broader weight management goal, though it’s one data point, not a full picture of health

FAQs

Final Thoughts

Cucumber tomato onion salad isn’t trying to reinvent anything, and that’s exactly what makes it worth keeping in your rotation. It rewards a little technique, mainly that salting step, without asking for much time in return. Once you’ve made it a few times, you’ll notice small tweaks that fit your own taste, whether that’s a heavier hand with the vinegar or a handful of feta on top.

If you’re looking for more ways to bring fresh, simple vegetables into your weekly meals, our vegan salad recipes collection is a good place to keep exploring.

Cucumber Tomato Onion Salad

A crisp, no-cook salad of sliced cucumber, ripe tomato, and red onion tossed in a simple olive oil and vinegar dressing. Ready in 15 minutes — perfect for cookouts, meal prep, or a light summer side.

Print Recipe Pin Recipe

Prep Time 15 minutes mins

10 minutes mins

Total Time 25 minutes mins

Course Salad, Side Dish

Cuisine American, Mediterranean

Servings 4 people

Calories 50 kcal

Equipment

• Large mixing bowl
• Small bowl
• Sharp knife or mandoline
• Cutting board

Ingredients

  

• 2 English or Persian cucumbers sliced into thin rounds
• 2-3 medium tomatoes or 1 pint cherry tomatoes halved
• 1/2 red onion thinly sliced
• 2-3 tbsp olive oil
• 1-2 tbsp vinegar or lemon juice red wine apple cider, or white vinegar
• salt to taste
• black pepper to taste
• fresh basil parsley, or dill optional, chopped

Instructions

 

• Salt the cucumbers — Salt the sliced cucumbers lightly and let them sit in a colander for 10 minutes to release excess water, then pat dry with a paper towel.
• Prep the rest of the vegetables — While the cucumbers drain, halve or quarter the tomatoes and thinly slice the red onion.
• Make the dressing — In a small bowl, whisk together the olive oil, vinegar or lemon juice, salt, and pepper.
• Toss the salad — Combine the cucumber, tomato, and onion in a large bowl. Pour the dressing over the top and toss gently. Fold in fresh herbs, if using.
• Chill and serve — Refrigerate for at least 10 minutes before serving so the flavors come together.

Video

Notes

• For a milder onion flavor, soak the sliced red onion in cold water for 10 minutes before adding it in.
• Add the dressing right before serving — this keeps the salad from turning watery.
• Store undressed leftovers in the fridge for up to 3 days; once dressed, eat within 24 hours for the best texture.

Keyword cucumber salad, cucumber tomato onion salad, tomato salad

Muhammad Ahtsham

Muhammad Ahtsham is the founder of EatLikeFit.com and a nutrition researcher dedicated to healthy weight management. He provides practical, science-backed advice on high-protein diets and affordable meal planning to help readers achieve their fitness goals simply and effectively.