Marinated Cucumber, Tomato, and Onion Salad
The Ultimate Make-Ahead Summer Salad
Looking for the perfect summer side that’s light, refreshing, and incredibly easy to make? This Marinated Cucumber, Tomato, and Onion Salad is your go-to.
Made with just a few fresh ingredients and tossed in a zesty, herb-infused dressing, it’s the kind of salad that actually gets better the longer it sits. The cucumbers and onions develop a crisp, lightly pickled bite, while the juicy tomatoes soak up all that vibrant flavor creating a medley that’s equal parts crunchy, tangy, and irresistible.
Serve it alongside grilled meats, spoon it over greens for a quick salad bowl, or mix it into cold pasta for an effortless meal. Got leftovers? Turn them into a chilled gazpacho or use the marinated juices as a bold, homemade dressing.
Fresh, flavorful, and endlessly versatile this is one summer salad you’ll be making on repeat.
Why You’ll Love This Salad
- This salad is summer in a bowl: crisp cucumbers, juicy tomatoes, and sharp onions soaked in a tangy, aromatic marinade. The flavors deepen over time making it perfect to prepare ahead. Serve it with grilled meats, as a light lunch, or toss into pasta or greens. Leftovers even make a bright gazpacho or dressing.
Ingredients Breakdown
For the Salad
Tomatoes: Go for ripe, juicy beefsteak tomatoes for maximum flavor. Roma or cherry tomatoes are great alternatives just make sure they’re firm and fresh.
Cucumbers: English cucumbers are ideal thanks to their thin skin and mild, sweet flavor — no peeling needed. But feel free to use any variety you have on hand.
Red Onion: Adds a sharp, savory crunch that balances the sweetness of the tomatoes. For a milder option, substitute with Vidalia or yellow onion.
For the Dressing
Extra-Virgin Olive Oil: Brings richness and helps tie all the flavors together into one harmonious bite.
Sherry Vinegar: Delivers a bright, tangy edge that complements the natural sweetness of the vegetables. Apple cider or red wine vinegar work too.
Dried Herbs: A mix of Italian seasoning or herbes de Provence adds aromatic depth and a touch of earthiness.
Kosher Salt: Enhances and sharpens the natural flavors of the vegetables and dressing.
Black Pepper: Freshly ground for a gentle kick of heat and complexity.
Red Pepper Flakes (Optional): If you enjoy a bit of spice, a pinch goes a long way in adding subtle heat.
For Garnish
Fresh Herbs: Add a final pop of color and flavor with chopped parsley, basil, chives, or chervil. A sprinkle just before serving brings everything to life.
The Ultimate Make-Ahead Summer Salad
A light, refreshing salad packed with cucumbers, tomatoes, and onions marinated in a tangy herb dressing perfect to prep ahead for picnics, BBQs, or easy summer meals.
Course: Side Dish Cuisine: American, Southern Keyword: Marinated Cucumber, Tomato, and Onion Salad Prep Time: 15minutes minutes Marinate Time:: 24minutes minutes Total Time: 24minutes minutes Servings: 6
Ingredients You’ll Need
Ingredients
For the Salad
- 1 large English cucumber (or 2 regular), peeled or unpeeled, cut into ½‑inch chunks
- 3 medium ripe tomatoes, cored and chopped
- 1 medium red onion, thinly sliced
- ⅔ cup extra virgin olive oil
- 2½ Tbsp sherry vinegar (or white wine/ apple cider vinegar)
- 1 Tbsp dried Italian herbs or herbes de Provence
- 1 tsp kosher salt
- ½ tsp freshly ground black pepper
- Pinch red pepper flakes (optional, for spice)
- Fresh herbs for garnish (parsley, basil, chives, mint)
Instructions
- Prepare the dressing
- In a large bowl, whisk together olive oil, vinegar, dried herbs, salt, pepper, and red pepper flakes (if using) until well combined.
- Add the vegetables
- Gently fold in the cucumber chunks, tomato pieces, and thin onion slices, coating each piece with the dressing.
- Marinate
- Let the salad sit at room temperature for about 1 hour, stirring occasionally. Then cover and refrigerate for at least 12 hours, up to 24 hours, to allow the flavors to meld deeply.
- Before serving
- Take it out of the fridge 30–60 mins before serving to let flavors re-awaken. Toss gently, taste and adjust seasoning. Garnish with fresh herbs.
Tips & Variations
- Reduce sogginess: If you prefer crunch, sprinkle sliced cucumbers with a little salt and let sit 10–15 min. Then drain the excess liquid before mixing.
- Tomato choice: Roma or beefsteak tomatoes work best firm yet ripe. Avoid overly soft ones that will break down.
- Milder onion flavor: Soak the sliced onion in cold water for 10 min, then drain this softens the harsh bite.
- Vinegar swap ideas: Apple cider, red wine, or white wine vinegars all work. Use a teaspoon of sugar if your vinegar is very sharp.
- Extras you can add:
- • Chopped bell peppers, radishes, or shredded carrots
- • Feta cheese or goat cheese
- • Kalamata olives or capers
- • Fresh mint or dill
- Use as a base or transform:
- • Toss into cooked pasta, couscous, or quinoa for a more filling dish
- • Blend leftovers into a chilled gazpacho or use the liquid as a bright vinaigrette
Storage & Serving
Store in an airtight container in refrigerator for up to 4 days.
Over time, the vegetables will soften. Always stir before serving.
Serve cold or at room temperature for best flavor.
Nutrition
Calories: 247 kcal | Carbohydrates: 8g | Protein: 1.4g | Fat: 24.4g | Saturated Fat: 3.4g Cholesterol: 0mg | Sodium: 393mg | Potassium: 294mg | Fiber: 1.9g | Sugar: 3.9g Vitamin A: 577 IU | Vitamin C: 10.4mg | Calcium: 21.2mg | Iron: 0.5mg
Frequently Asked Questions
Can I make it a few days in advance?
Yes it actually tastes better after marinating longer.
Do I need to peel the cucumber?
Not necessary if using English cucumber. Regular cucumbers may benefit from peeling.
What if I don’t have dried herbs?
Use 1 Tbsp chopped fresh herbs (basil, oregano, parsley).
Can I skip vinegar?
You can substitute with lemon juice, but the flavor will be slightly different.
Is this salad keto / low-carb?
Yes, it’s naturally low in carbs (veg + oil + vinegar) if you skip any sugary additions.
Conclusion
This Marinated Cucumber, Tomato & Onion Salad brings freshness, flavor, and ease to your summer meals. Because it improves with time, it’s ideal for prepping ahead. Use it as a standalone side, toss with grains for a quick lunch, or turn leftovers into a vibrant dressing or cold soup. Try it once and you’ll find yourself making it all season long.
