Marinated Cucumber, Onion, and Tomato Salad: A Fresh and Flavorful Step-by-Step Recipe

Marinated Cucumber, Onion, and Tomato Salad is a classic side dish that celebrates the fresh flavors of crisp cucumbers, juicy tomatoes, and thinly sliced onions tossed in a tangy homemade vinaigrette. This refreshing salad is simple to prepare, yet it delivers a bright combination of sweet, savory, and slightly acidic flavors that improve as the vegetables marinate.

Perfect for summer barbecues, family dinners, potlucks, picnics, or light lunches, this salad pairs beautifully with grilled meats, seafood, sandwiches, or roasted vegetables. Best of all, it can be made ahead of time, allowing the vegetables to soak up the delicious dressing for even more flavor.

Why You’ll Love This Salad

Marinating transforms ordinary vegetables into a flavorful dish. The vinegar softens the onions, the cucumbers absorb the seasoned dressing, and the tomatoes release their natural juices, creating a light and refreshing marinade that coats every bite.

Unlike creamy salads, this recipe is light, naturally colorful, and full of garden-fresh flavor.

Ingredients

For the Salad

• 2 large cucumbers, sliced into thin rounds
• 3 medium ripe tomatoes, cut into wedges or bite-sized chunks
• 1 medium red onion, thinly sliced
• 2 tablespoons chopped fresh parsley
• 1 tablespoon chopped fresh dill (optional)

For the Marinade

• ½ cup apple cider vinegar or red wine vinegar
• ¼ cup extra virgin olive oil
• 2 tablespoons granulated sugar
• 1 teaspoon salt
• ½ teaspoon freshly ground black pepper
• 1 teaspoon Italian seasoning
• ½ teaspoon garlic powder
• 1 teaspoon Dijon mustard (optional, for extra flavor)
• 1 tablespoon fresh lemon juice

Step 1: Wash and Prepare the Vegetables

Begin by thoroughly washing all the vegetables under cold running water.

Slice the cucumbers into thin, even rounds about ¼ inch thick. If using large cucumbers with thick skin, you may peel them completely or partially for a striped appearance.

Cut the tomatoes into wedges or large chunks. Choose ripe but firm tomatoes so they hold their shape while marinating.

Peel the onion and slice it as thinly as possible. Thin slices allow the onion to absorb the marinade quickly while becoming milder in flavor.

Place all the prepared vegetables into a large mixing bowl.

Step 2: Prepare the Marinade

In a separate bowl or measuring cup, combine the vinegar, olive oil, sugar, salt, black pepper, Italian seasoning, garlic powder, Dijon mustard, and lemon juice.

Whisk the mixture thoroughly until the sugar dissolves and the oil begins to emulsify with the vinegar.

The finished dressing should have a balanced flavor that is slightly tangy, lightly sweet, and well-seasoned.

Taste the marinade before using it. If you prefer a sharper salad, add a little more vinegar. If you enjoy a sweeter dressing, stir in another teaspoon of sugar.

Step 3: Combine the Salad

Pour the prepared marinade over the cucumbers, tomatoes, and onions.

Using two large spoons or salad tongs, gently toss everything together until every vegetable is evenly coated.

Take care not to crush the tomatoes while mixing.

The vegetables will immediately begin releasing some of their natural juices, which blend with the dressing to create even more flavor.

Step 4: Add the Fresh Herbs

Sprinkle the chopped parsley and fresh dill over the salad.

Gently toss once more to distribute the herbs evenly throughout the vegetables.

Fresh herbs brighten the salad and add a pleasant aroma that complements the tangy dressing.

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