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Marinated Cucumber, Tomato and Onion Salad

There is something wonderfully refreshing about a simple salad made with crisp cucumbers, juicy tomatoes, and thinly sliced onions. This Marinated Cucumber, Tomato and Onion Salad takes those everyday vegetables and turns them into a bright, flavorful side dish with a tangy homemade dressing.

The secret is in the marinating time. Instead of simply tossing the vegetables with dressing and serving immediately, the salad is allowed to rest so the vinegar-based marinade can soak into the vegetables. The cucumbers remain pleasantly crisp, the tomatoes add natural sweetness and juiciness, and the onions develop a milder, slightly pickled flavor.

It is an easy recipe that requires no cooking, making it especially useful for warm days when you want something fresh without turning on the stove.

Why You’ll Love This Salad

This salad is simple enough for a busy weeknight but flavorful enough to serve alongside a larger meal. It requires just a handful of fresh ingredients and a few minutes of preparation.

The combination works particularly well because each vegetable contributes something different. Cucumbers provide crunch and freshness, tomatoes bring sweetness and moisture, while onions add a sharp savory note. The marinade ties everything together with acidity, a touch of sweetness, and herbs.

It can be served immediately, but letting it chill for at least 30 minutes gives the flavors more time to mingle.

Ingredients

For the Salad

2 large cucumbers
3 medium ripe tomatoes
1 small red or yellow onion
2 tablespoons chopped fresh parsley
1 tablespoon chopped fresh dill, optional

For the Marinade

1/4 cup apple cider vinegar or white vinegar
3 tablespoons extra-virgin olive oil
1 tablespoon granulated sugar
1/2 teaspoon salt
1/4 teaspoon freshly ground black pepper
1 small garlic clove, finely minced
1/2 teaspoon dried oregano

You can easily adjust the dressing according to your taste. If you prefer a sharper salad, add a little more vinegar. For a gentler flavor, add another small splash of olive oil or reduce the vinegar slightly.

Choosing the Best Vegetables

Because this recipe uses only a few ingredients, freshness makes a noticeable difference.

Choose cucumbers that feel firm and have smooth, unblemished skin. English cucumbers are especially convenient because they have thin skins and fewer seeds, but regular garden cucumbers work perfectly well.

For the tomatoes, select ripe tomatoes that are fragrant and firm enough to hold their shape after being sliced. Roma tomatoes, vine-ripened tomatoes, or garden tomatoes can all be used.

A red onion adds beautiful color and a pleasant bite. If you find raw onion too strong, soaking the sliced onion briefly in cold water can mellow its flavor before adding it to the salad.

How to Make Marinated Cucumber, Tomato and Onion Salad

Step 1: Prepare the Cucumbers

Start by washing the cucumbers thoroughly under cool running water.

Slice them into thin rounds. You can leave the peel on for extra color and texture, especially when using English cucumbers. If using large garden cucumbers with thick skins or many seeds, peeling them partially or completely is another option.

For slightly more bite, avoid slicing the cucumbers paper-thin. Pieces around 1/8 to 1/4 inch thick generally provide a good balance between tenderness and crunch.

Place the cucumber slices in a large mixing bowl.

Step 2: Slice the Tomatoes

Wash and dry the tomatoes before cutting them.

Slice them into wedges or bite-sized chunks, depending on the type of tomato you’re using. Try to keep the pieces relatively similar in size so that every serving contains a good mixture of vegetables.

Add the tomatoes to the bowl with the cucumbers.

If the tomatoes are exceptionally juicy, you can remove some of the seeds before chopping them. This isn’t essential, but it can prevent the finished salad from becoming overly watery.

Step 3: Prepare the Onion

Peel the onion and cut it in half from root to tip.

Slice it as thinly as possible. Thin slices allow the marinade to penetrate the onion more effectively and soften its sharpness.

If you prefer a milder onion flavor, place the slices in a bowl of cold water for about 5 to 10 minutes. Drain and pat them dry before adding them to the vegetables.

Add the onion to the cucumber and tomato mixture.

Step 4: Make the Marinade

In a small bowl or measuring cup, combine the vinegar, olive oil, sugar, salt, black pepper, minced garlic, and oregano.

Whisk everything together until the sugar and salt are mostly dissolved and the dressing looks well combined.

The dressing should taste bright and slightly tangy. Remember that the vegetables will release some of their natural juices as they marinate, which will slightly dilute the dressing.