Marinated Cucumbers, Onions, and Tomatoes make for a vibrant and refreshing side dish that captures the best of summer produce. This easy marinated salad recipe blends crisp cucumbers, juicy tomatoes, and tangy onions in a bold vinaigrette infused with herbs and spices. Whether you’re serving it at a backyard BBQ or as a light lunch companion, it delivers big flavor with minimal effort.

The key to this marinated cucumbers, onions, and tomatoes dish lies in its balance—fresh vegetables soak up the seasoned vinegar-based dressing, transforming into something zesty, juicy, and irresistible. Best of all, it’s naturally vegan, low-carb, and easy to prep ahead, making it a staple for warm-weather meals or quick weeknight dinners.

What Is the Marinated Cucumbers, Onions, and Tomatoes?

This Southern-inspired recipe combines sliced cucumbers, cherry or grape tomatoes, and thinly sliced onions, all tossed in a vinegar-based marinade. The mixture typically includes olive oil, vinegar (often apple cider or white), sugar, herbs like dill or parsley, and a touch of spice for depth. After marinating in the fridge for a few hours (or overnight), the vegetables become infused with tangy, herby flavor while still retaining their crunch.

Marinated cucumbers, onions, and tomatoes are a classic make-ahead side dish perfect for picnics, potlucks, or daily meal prep. Its refreshing bite pairs well with grilled meats, sandwiches, or hearty vegetarian mains, making it an adaptable addition to your table.

Ingredients for Marinated Cucumbers, Onions, and Tomatoes

To make this crisp and tangy salad, you’ll need:

2 medium cucumbers, thinly sliced
1 pint cherry or grape tomatoes, halved
1 small white onion, thinly sliced
1/4 cup apple cider vinegar (or white vinegar)
1/4 cup olive oil
1 tablespoon sugar (optional, for balance)
1 teaspoon dried parsley or dill
1/2 teaspoon salt
1/2 teaspoon freshly ground black pepper
1/4 teaspoon red pepper flakes (adjust to taste)
1 clove garlic, minced (optional)

How To Make the Marinated Cucumbers, Onions, and Tomatoes

Step 1: Prep the Vegetables

Wash and dry the cucumbers and tomatoes. Slice the cucumbers into thin rounds and halve the cherry tomatoes. Peel and thinly slice the onion. Add everything to a large mixing bowl or directly into a mason jar for storage.

Step 2: Mix the Marinade

In a small bowl or jar, whisk together the apple cider vinegar, olive oil, sugar (if using), dried parsley, salt, black pepper, red pepper flakes, and minced garlic if adding. Taste and adjust seasoning as needed.

Step 3: Combine and Toss

Pour the marinade over the vegetables. Toss well to ensure all the pieces are coated. If you’re using a jar, seal it tightly and give it a good shake to mix.

Step 4: Marinate

Cover the bowl (or refrigerate the sealed jar) and let it sit in the fridge for at least 2–4 hours, preferably overnight. The longer it sits, the more flavorful the vegetables become.

Step 5: Serve

Give it a quick stir before serving. Enjoy chilled or at room temperature.

What to Serve with Marinated Cucumbers, Onions, and Tomatoes

This marinated vegetable salad is wonderfully versatile. It complements grilled meats like chicken, steak, or pork chops perfectly, cutting through the richness with its acidity. For a light lunch, pair it with a crusty baguette and a hunk of feta or goat cheese. It also works beautifully alongside dishes like fried fish, BBQ ribs, or falafel wraps. Want to keep it plant-based? Serve it next to lentil patties or chickpea salad sandwiches for a satisfying combo.

Top Tips for Perfecting Marinated Cucumbers, Onions, and Tomatoes

Use firm, fresh produce. English or Persian cucumbers work best for their crunch and low seed content. Cherry tomatoes offer sweetness and hold their shape well.
Let it sit. Don’t rush the marinating process—at least 4 hours in the fridge is key for maximum flavor absorption.
Customize the marinade. Swap apple cider vinegar for white wine or rice vinegar, or add a squeeze of lemon for brightness. A pinch of smoked paprika or a splash of hot sauce can also dial up the flavor.

Want More Summer Salad Ideas?

You might also like the Watermelon Feta Mint Salad, a cooling mix of salty-sweet with juicy texture. Or try the Chickpea Cucumber Salad for a protein-packed, tangy option.

For something creamy, the Greek Yogurt Potato Salad offers a lighter twist on the classic. Or, if you’re after bold flavor, the Spicy Corn and Avocado Salad brings heat and creaminess in every bite.

Looking for a crowd-pleaser? The Creamy Coleslaw with Apple and Celery brings crunch and a hint of sweetness—perfect for potlucks and BBQs.