This Tomato and Onion Salad is the perfect way to put your fresh summer produce to use! Sweet, savory, and tangy, and ready in minutes, it’s the perfect addition to weeknight meals and backyard BBQs. 

Looking for more tomato salads? Try our heirloom tomato salad or tomato cucumber mozzarella salad. 

tomato and onion salad on white oval platter. this recipe
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You Will Love This Tomato Onion Salad

Have more tomatoes than you know what to do with this summer? Put them to use in this easy tomato and onion salad! A staple in my house, this is one dish that I make on repeat every year, along with our margherita pasta or grilled chicken with balsamic.

Full of flavor, it’s great for feeding a crowd and perfect for quick weeknight meals, cookouts, and summer parties, along with our cucumber onion salad.. Plus, with just 9 ingredients and no cooking required, it couldn’t be easier to prepare! And it’s best served at room temperature. So, you can whip it up, and move on to preparing the rest of your meal. 

In just 15 minutes, the flavors will meld together for the most delicious sweet and bold taste. Consider yourself warned that you’ll be making it for days on end. It really is that tasty! 

Onion and Tomato Salad Ingredients

See the recipe card for full information on ingredients and quantities.

ingredients for tomato salad with onions and parsley.
  • Tomatoes: Fresh, ripe tomatoes form the base of the salad. 
  • Red onion: Adds a vibrant burst of color and a mild, slightly sweet flavor.
  • Herbs and spices: Fresh Italian parsley, salt, pepper, and dried oregano create a bright, savory taste. 
  • Extra virgin olive oil: This forms the base of the dressing, creating a smooth consistency and a rich flavor. 
  • Red wine vinegar: For the most authentic taste, stick to red wine vinegar. 
  • Sugar: Use granulated or cane sugar to add a subtle hint of sweetness. 

What Type of Tomatoes to Use

The riper your tomatoes, the better your salad will taste! Make sure they’re fresh and served at room temperature for the best taste. Pretty much any type of tomato you have on hand and like best will work well. However, for the best results, use fresh, in-season varieties. 

Some of my favorite options include: 

  • Grape Tomatoes
  • Cherry Tomatoes
  • Heirloom Tomatoes 
  • Roma Tomatoes

How to Make Tomato Onion Salad

Check out the recipe card below for detailed instructions. 

arranged tomatoes with red onions and parsley on oval platter.

Step 1: Arrange the sliced tomatoes, onions, and parsley in a large bowl or on a serving platter. 

dressing in glass bowl being whisked.

Step 2: Whisk the dressing ingredients in a small bowl. 

dressing spooned over tomato salad.

Step 3: Pour or spoon the dressing over the tomatoes.

tomato salad being tossed with two spoons.

Step 4: Gently toss to combine, ensuring all the tomatoes are completely coated. 

What to Serve with Tomato and Onion Salad

This recipe pairs well with just about any summer main course, but some of our favorite options include: 

Tips for Tomato Salad with Onions

  • Mix and match different tomatoes for a unique taste and texture. For best flavor, make sure to use ripe tomatoes.
  • Don’t skip the rest time! If the ingredients are cold when serving, your salad will taste bland. It’s best served at room temperature.
  • For a creamy salad, add 1-2 tablespoons of mayonnaise to the dressing.
sliced tomatoes topped with red onions and parsley.

More Tomato Recipes

Tomato Salsa Recipe

Ina Garten Roasted Tomato Soup

Pasta with Spinach and Tomatoes

Chickpea Tomato Salad

If you try Tomato Salad with Onions, please leave a star rating and a comment letting us know how you liked the recipe.

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tomato and onion salad on white oval platter.

Tomato Salad with Onions

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  • Author: Katya
  • Prep Time: 15 min
  • Total Time: 15 minutes
  • Yield: 4-6 1x
  • Category: Salad
  • Cuisine: Italian
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Description

This Tomato and Onion Salad is the perfect way to put your fresh summer produce to use! Sweet, savory, and tangy, and ready in minutes, it’s the perfect addition to weeknight meals and backyard BBQs. 

Ingredients

Units Scale
  • 1 1/2 lbs. ripe tomatoes, cut into wedges, preferably at room temperature
  • 1 small red onion, thinly sliced
  • 2 Tbsp. fresh Italian parsley, chopped
  • 3 Tbsp. extra-virgin olive oil
  • 1 Tbsp. red wine vinegar
  • 1 tsp. kosher salt
  • 1/2 tsp. black pepper
  • 1/2 tsp. granulated or cane sugar
  • 1/2 tsp. dried oregano

Instructions

  1. In a large bowl or serving platter, arrange the sliced tomatoes, onions, and parsley.
  2. Whisk together the oil, vinegar, salt, pepper, sugar, and oregano. Pour the dressing over the tomatoes. Toss gently to combine, ensuring all the tomatoes are coated with the dressing.
  3. Let the salad sit at room temperature for about 15 minutes to allow the flavors to meld. Serve the salad at room temperature.

Nutrition

  • Serving Size: 1/6
  • Calories: 88
  • Sugar: 3.8 g
  • Sodium: 213.8 mg
  • Fat: 7.3 g
  • Carbohydrates: 6.1 g
  • Protein: 1.2 g
  • Cholesterol: 0 mg