Marinated Tomato Onion Salad

By Tyla | Last modified on Feb 26, 2026

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Marinated Tomato Onion Salad

Fresh, vibrant, and bursting with flavor, this Marinated Tomato Onion Salad is a delightful dish perfect for any season. The combination of ripe tomatoes and crisp red onions soaked in a tangy, herb-infused dressing creates a refreshing experience that awakens the taste buds.

Easy to prepare and wonderfully versatile, this salad pairs beautifully as a side dish or a light lunch. Its simplicity lets the natural sweetness of garden-fresh tomatoes shine, enhanced by the subtle aroma of fresh basil and the zesty notes of white wine vinegar.

Why You’ll Love This Recipe

  • Simple ingredients that transform into a refreshing, flavorful salad.
  • Perfect for using fresh, homegrown tomatoes during peak season.
  • Make-ahead dish allowing flavors to meld beautifully for any meal.

Ingredients

  • Red onion: Thinly sliced to provide a crisp and slightly pungent contrast to the sweetness of tomatoes.
  • Ripe tomatoes: Chopped into bite-sized pieces, they deliver juicy freshness and natural sweetness to the salad.
  • Olive oil: A smooth, fruity base for the dressing that balances acidity and coats ingredients evenly.
  • White wine vinegar: Adds a subtle tang that brightens the flavors without overpowering the salad.
  • Sugar: Just a touch to balance the acidity and enhance the natural tomato sweetness.
  • Salt: Essential for bringing out the depth of all ingredients and seasoning the salad perfectly.
  • Fresh basil: Chopped finely, it contributes a fragrant, slightly sweet herbal note to the dish.
  • Fresh parsley: Used as a garnish, it adds a fresh, vibrant touch and mild peppery undertones.
  • Fresh ground pepper: Sprinkled to taste, it introduces a mild heat and complexity to the salad.

Instructions

Create the Dressing

In a small bowl, combine olive oil, white wine vinegar, sugar, salt, and chopped fresh basil. Whisk thoroughly until the sugar and salt dissolve, ensuring a balanced, flavorful dressing that will marry all the salad ingredients.

Prepare the Vegetables

Thinly slice the red onion for a delicate crunch, and chop the ripe tomatoes into bite-sized pieces. This prep allows the vegetables to absorb the marinade fully, enhancing their natural flavors.

Combine and Toss

Place the sliced onions and chopped tomatoes into a large bowl. Pour the prepared dressing over them and gently toss to coat every piece evenly. This step ensures that every bite is flavorful and well-seasoned.

Marinate in Refrigerator

Cover the bowl and refrigerate for at least four hours. This chilling period allows the tomatoes and onions to soak up the dressing, softening the onion’s sharpness and intensifying the salad’s overall taste.

Serve Garnished

Before serving, sprinkle fresh chopped parsley over the salad and add freshly ground pepper to taste. These final touches add brightness and a gentle heat, perfect for finishing the dish elegantly.

You Must Know

  • This salad benefits from marinating as it allows flavors to develop deeply.
  • Add feta cheese for a creamy, salty complement that enhances texture and taste.
  • Ideal as a refreshing side or light, healthy lunch option.

Storage Tips

Store the marinated salad in an airtight container in the refrigerator for up to 2 days. Keep it chilled to maintain freshness and prevent the tomatoes from becoming too soft.

Serving Suggestions

Serve this salad chilled alongside grilled meats, crusty bread, or as a topping for toasted crostini. It also pairs wonderfully with Mediterranean-inspired dishes or a light pasta meal.

Professional Tips

  • Use the freshest tomatoes you can find for maximum flavor and juiciness.
  • Slice onions thinly to avoid overpowering the salad and to blend smoothly with other ingredients.
  • Adjust sugar and vinegar to suit your taste preferences for the perfect balance.

FAQs

Can I use other types of tomatoes?

Yes, cherry, grape, or heirloom tomatoes can be used to add variety in flavor and texture.

Is it necessary to marinate the salad for 4 hours?

While you can serve it sooner, marinating for at least 4 hours enhances flavor melding and reduces onion sharpness.

Can I make this salad vegan?

Absolutely, this salad is naturally vegan. Just omit any cheese addition.

What can I add for extra protein?

Try topping with crumbled feta, chickpeas, or grilled chicken slices for a more filling meal.

How long does this salad keep in the fridge?

Best consumed within 2 days for freshness, as tomatoes may start breaking down over time.

Can I prepare the dressing in advance?

Yes, the dressing can be made a day ahead and stored in the refrigerator for convenience.

Marinated Tomato Onion Salad

Marinated Tomato Onion Salad

A refreshing marinated salad featuring ripe tomatoes and red onion, enhanced by olive oil, vinegar, basil, and a hint of sweetness. Perfect make-ahead dish for light lunches or flavorful sides.
Prep Time 10 minutes
Total Time 10 minutes
Course Salad, Side Dish
Cuisine American
Servings 4 people
Calories 150 kcal

Equipment

  • 1 mixing bowl
  • 1 refrigerator for chilling

Ingredients
  

  • 1 red onion thinly sliced
  • 4 tomatoes chopped into bite-sized pieces
  • ½ cup olive oil
  • cup white wine vinegar
  • 1 tablespoon sugar
  • ½ teaspoon salt
  • 2 tablespoons chopped fresh basil
  • Fresh parsley for garnish
  • Fresh ground pepper to taste

Instructions
 

  • In a small bowl, whisk together olive oil, white wine vinegar, sugar, salt, and chopped basil.
  • Place sliced red onions and chopped tomatoes into a mixing bowl.
  • Pour the oil and vinegar mixture over the onions and tomatoes and toss gently to coat.
  • Cover and refrigerate the salad for at least 4 hours to marinate and develop flavors.
  • Before serving, garnish with fresh chopped parsley and season with fresh ground pepper to taste.

Notes

  • Great make-ahead salad using fresh summer tomatoes.
  • Feta cheese can be added for extra flavor.
  • Serve chilled for best taste.
  • Ideal as a light lunch or side dish.

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