This simple Tomato Onion Salad is what summer side dishes are all about. Big, juicy chunks of ripe tomato, sharp slices of onion, and a quick vinaigrette that pulls it all together. It’s fresh, fast, and loaded with flavor from the red wine vinegar and Italian herbs.

Fresh Tomato Onion Salad

This is one of those dishes that doesn’t look like much, but always disappears fast. The dressing soaks into the onions, softening their bite just enough without making them soggy.

Letting the salad sit for a bit before serving is key. It gives the tomatoes time to release their juices, and that dressing turns into something you’ll want to sop up with crusty bread.

Don’t overthink the ingredients. Use the best tomato you can find, slice up a strong onion, and give it time to hang out. It only takes a few minutes of hands-on time, but the flavor payoff is huge.

Why You’ll Love This Dish

• Quick & Easy – Comes together in minutes with basic pantry ingredients.
• Fresh & Bold – Tomato, onion, vinegar, and herbs make a bright, punchy combo.
• No Cooking Required – Great for hot days when you don’t want to turn on the stove.
• Great Make-Ahead – Tastes even better after sitting for 30 minutes or more.
• Versatile Side – Works with grilled meats, pasta, burgers, or just a chunk of bread.

Grilled Porterhouse

Recipe Shopping List

Wondering if you have to hit the store? Here's the list of items you'll need to make this recipe. For specific amounts, please refer to the printable recipe card at the bottom of the post.

• Ripe Beefsteak Tomato – Meaty, juicy, and full of flavor. Heirlooms or vine-ripened work great too.
• Medium Onion – White or red both work. Red has more bite; white is a bit milder once marinated.
• Red Wine Vinegar – Adds tang and brightness. White wine vinegar or apple cider vinegar can sub in.
• Olive Oil – Adds richness and helps carry the flavors of the herbs and vinegar.
• Italian Seasoning – A balanced mix of herbs. You can use oregano or basil if you’re out.
• Black Pepper – Gives the salad a little kick and balances the acidity.
• Salt – Draws out juices and helps the tomatoes shine.

Easy Filet Mignon Recipe!

How To Make This Recipe

This is just the overview so you can see what you're actually getting into here. When you are cooking, you'll want to use the full recipe at the bottom of the page.

1. Prep The Vegetables – Cut the tomato into large chunks and slice the onion thinly.
2. Make The Dressing – Add vinegar, olive oil, Italian seasoning, salt, and pepper to a jar. Shake well to emulsify.
3. Toss It Together – Combine the tomato and onion in a bowl. Pour dressing over the top and toss gently.
4. Let It Sit – Let the salad rest for 30 minutes to marinate and let the flavors develop.
5. Serve – Give it a quick stir and serve as-is or with some crusty bread to soak up the juices.

Flat Iron Steaks are my favorite!

Recipe FAQ

Smoked Pork Chops

Serve This With

• Smoked Spatchcock Chicken
• Traeger T-Bone Steaks
• Italian Pasta Salad
• Traeger Grilled Beer Brats

This tomato onion salad is simple, sturdy, and full of flavor. It’s a low-effort side that feels fresh and homemade, perfect for rounding out grilled meals or serving alongside something rich and smoky. Make it once and it’ll be on repeat all season.