Tomato and Onion Salad

The first time I made this salad, I was rushing to put something on the table for unexpected guests who had just dropped by. I grabbed whatever was in my crisper drawer, assuming a simple tomato and onion salad would be underwhelming, but the way the sharp onions balanced against sweet, ripe tomatoes surprised everyone at the table. Sometimes the most humble dishes end up being the ones people ask about again and again.

Last summer, my neighbor brought over the most beautiful heirloom tomatoes from her garden, and I made this salad as a side for grilled chicken. We sat on her back porch eating outside, and she confessed she'd never thought to pair red wine vinegar with tomatoes before. Now she makes it every week when her tomato plants start producing more than she knows what to do with.

Ingredients

• 4 medium ripe tomatoes: Choose tomatoes that give slightly when pressed and smell fragrant, as underripe tomatoes won't have the sweetness needed to balance the sharp onions
• 1 large red onion: Thin slices are crucial here, and if the onion tastes too potent, try soaking the slices in cold water for ten minutes before using
• 2 tablespoons fresh parsley: The bright herbal finish cuts through the dressing and adds a pop of color that makes the whole dish feel more complete
• 3 tablespoons extra-virgin olive oil: A quality olive oil makes a noticeable difference since the dressing is so simple
• 1 tablespoon red wine vinegar: Provides just enough acid to brighten everything without overwhelming the tomatoes
• 1 teaspoon lemon juice: Adds a bright, fresh note that lifts the entire dressing
• ½ teaspoon salt: Essential for drawing moisture out of the tomatoes and helping all the flavors meld together
• ¼ teaspoon freshly ground black pepper: Freshly ground gives a more complex, aromatic spice than pre-ground pepper

Instructions

Prep your vegetables:

Arrange the sliced tomatoes and onions on a large serving plate, overlapping them slightly so the dressing can reach everything evenly

Make the dressing:

Whisk together the olive oil, red wine vinegar, lemon juice, salt, and black pepper in a small bowl until the mixture emulsifies slightly

Dress the salad:

Drizzle the dressing evenly over the tomatoes and onions, aiming to get some on every slice

Add the finishing touch:

Sprinkle the chopped parsley over the top for a burst of fresh color and flavor

Let it rest:

Allow the salad to marinate for 5 minutes before serving so the tomatoes release some of their juices into the dressing

Save

This became my go-to contribution to potlucks after I brought it to a friend's backyard barbecue and three separate people asked for the recipe. There is something about seeing those vibrant red tomatoes against the purple onions that makes people gravitate toward it before anything else on the table.

Making It Your Own

While the classic version is perfect on its own, I have discovered that adding thinly sliced cucumbers gives it even more crunch. A sprinkle of crumbled feta works beautifully if you want to make it more substantial, though I usually keep it vegan and let the vegetables shine.

What To Serve It With

This salad pairs beautifully with simply grilled meats, especially chicken or fish where the acidity cuts through the richness. I also love serving it alongside roasted vegetables or as part of a larger Mediterranean spread with hummus and warm pita bread.

Make Ahead Tips

You can slice the tomatoes and onions a few hours in advance, but wait to dress them until about 15 minutes before serving so they do not become too watery. The parsley should be added at the very last moment to keep it from wilting in the dressing.

• Leftovers keep for a day in the refrigerator, though the tomatoes will soften
• If you need to prep ahead, keep the dressing separate and toss right before serving
• This salad actually tastes better at room temperature than chilled straight from the fridge

Save

There is something deeply satisfying about a salad that relies entirely on the quality of its ingredients rather than complicated techniques. Every time I make it, I am reminded that sometimes the simplest food is the most memorable.

Recipe Questions & Answers

→ How do I make the onion flavor less sharp?

Soak the thinly sliced red onion in cold water for 10 minutes before assembling the salad. This simple step mellows the sharp bite while maintaining the crisp texture and mild sweetness that balances perfectly with ripe tomatoes.

→ Can I prepare this salad ahead of time?

For best results, prepare the vinaigrette and slice the vegetables up to 2 hours in advance. Store them separately in the refrigerator, then toss together just before serving. The salad can sit for up to 30 minutes after dressing, which actually enhances the flavors.

→ What other vegetables can I add?

Sliced cucumbers, bell peppers, or radishes work beautifully alongside the tomatoes and onions. You can also add fresh basil or mint instead of parsley for a different herb profile. For more substance, consider adding avocado chunks or olives.

→ Is this suitable for different dietary needs?

This salad is naturally vegetarian, vegan, and gluten-free. It's free from common allergens when prepared as written. If you choose to add feta cheese or other toppings, be mindful of dairy allergens and adjust accordingly for your guests.

→ What dishes pair well with this salad?

This versatile salad complements grilled meats like chicken, steak, or fish exceptionally well. It also shines alongside Mediterranean dishes such as hummus, falafel, or grilled vegetables. The crisp, acidic profile helps cut through rich or savory main courses.