A Fresh, Tangy, and Easy Summer Vegetable Salad
Marinated Cucumbers, Onions, and Tomatoes is a simple, refreshing side dish that’s perfect for warm-weather meals, backyard barbecues, picnics, and easy lunches. Crisp cucumbers, juicy tomatoes, and thinly sliced onions are tossed in a sweet and tangy vinegar dressing, then chilled so the vegetables have time to soak up all those delicious flavors.
This make-ahead salad requires just a handful of everyday ingredients and very little prep work. It’s naturally vegan and gluten-free, and it pairs beautifully with grilled meats, sandwiches, burgers, rice bowls, and more.
Ingredients
For the Vegetables
- 3 medium cucumbers, thinly sliced
- 1 large red onion, thinly sliced
- 3 cups cherry tomatoes, halved, or 4 medium tomatoes, sliced
For the Marinade
- ½ cup apple cider vinegar or white vinegar
- ¼ cup olive oil
- 2 tablespoons sugar or honey, adjusted to taste
- 1 teaspoon salt
- ½ teaspoon black pepper
- 1 teaspoon dried oregano or Italian seasoning
- 1 teaspoon garlic powder, or 1 fresh garlic clove, minced
- ¼ teaspoon red pepper flakes, optional
Optional Add-Ins
- Fresh dill or parsley, chopped
- 1 tablespoon lemon juice
- Crumbled feta cheese
How to Make Marinated Cucumbers, Onions, and Tomatoes
Step 1: Prepare the Vegetables
Wash the cucumbers and tomatoes thoroughly.
Slice the cucumbers into thin rounds or half-moons. Thinly slice the red onion to help mellow its flavor, then halve the cherry tomatoes. If using regular tomatoes, cut them into wedges or bite-sized slices.
Add all the prepared vegetables to a large mixing bowl.
Step 2: Make the Marinade
In a separate bowl or measuring cup, whisk together the vinegar, olive oil, sugar or honey, salt, black pepper, oregano, garlic powder, and red pepper flakes if using.
Continue whisking until the sugar dissolves and the ingredients are evenly combined.
Step 3: Combine Everything
Pour the marinade over the vegetables.
Gently toss everything together, making sure the cucumbers, onions, and tomatoes are evenly coated with the dressing.
Cover the bowl with plastic wrap or transfer the salad to an airtight container.
Step 4: Chill and Marinate
Refrigerate the salad for at least 1 hour before serving.
For even more flavor, let it marinate for 4 to 12 hours. Give the salad a gentle stir occasionally so the marinade coats the vegetables evenly.
Tips for the Best Marinated Vegetable Salad
- Use English cucumbers if possible because they contain less water and have a crisp texture.
- Slice the vegetables evenly so they marinate at the same rate.
- Allow the salad to rest overnight for a deeper, more developed flavor.
- Taste the dressing before adding it to the vegetables and adjust the vinegar, sugar, salt, or pepper to your liking.
- If using very juicy tomatoes, drain some of their excess liquid before adding them to the bowl.
Easy Variations
Mediterranean Style
Add crumbled feta cheese, Kalamata olives, and a little fresh parsley for a Mediterranean-inspired version.
Southern Style
Use white vinegar and slightly increase the sugar for a sweeter, tangier flavor.
Low-Sugar Version
Replace the sugar with your preferred sugar substitute, adjusting the amount to taste.
Fresh Herb Version
Add chopped fresh dill, basil, or parsley for extra freshness and flavor.
What to Serve with This Salad
Marinated Cucumbers, Onions, and Tomatoes make an excellent side dish for:
- Grilled chicken
- Steak or grilled beef
- Grilled or baked fish
- Burgers and sandwiches
- BBQ dishes
- Rice or quinoa bowls
- Wraps and grilled vegetables
The bright, tangy flavor also makes it a great way to balance out heavier meals.
Storage
Store the salad in an airtight container in the refrigerator for up to 3 days.
Keep in mind that the vegetables will become softer the longer they sit, but they’ll continue to absorb the flavorful marinade.
Why You’ll Love This Recipe
- Quick and easy: Minimal prep and no cooking required.
- Fresh and flavorful: Crisp vegetables meet a tangy, slightly sweet dressing.
- Make-ahead friendly: The flavor improves as the salad marinates.
- Versatile: Serve it alongside almost any grilled or casual meal.
- Simple ingredients: Everything comes together with basic pantry staples.
Final Thoughts
Marinated Cucumbers, Onions, and Tomatoes is proof that simple ingredients can create an incredibly flavorful dish. The combination of crisp vegetables, tangy vinegar, fragrant herbs, and a touch of sweetness makes this salad refreshing and satisfying without being complicated.
Whether you’re preparing a summer barbecue, looking for an easy side dish, or simply want something fresh to add to lunch or dinner, this marinated vegetable salad is an easy recipe worth keeping in your rotation.
