Southern Marinated Cucumber, Tomato, and Onion Salad

Why We Love This Recipe

• Make-Ahead Friendly: This salad actually improves as it sits, which makes it ideal for busy weeknights and entertaining.
• Old-Fashioned Southern Flavor: The vinegar-based dressing delivers the classic taste of cucumbers, tomatoes, and onions in vinegar that people search for.
• Light & Refreshing: Crisp cucumbers, juicy tomatoes, and softened onions keep it fresh without feeling heavy.
• Flexible Side Dish: It pairs easily with grilled meats, fried fish, or simple weeknight dinners.

Key Ingredients

Here's everything you'll need to make this old-fashioned tangy southern salad.

• Campari Tomatoes: We use these because they are naturally sweet and less watery, which keeps the salad from becoming soggy as it marinates.
• Mini Cucumbers: Crisp, tender, and thin-skinned, they hold their texture well in a vinegar dressing.
• Red Onion: Thinly sliced for bite without overpowering the salad.
• Garlic Cloves: Smashed and left whole so they infuse flavor without dominating.
• White Vinegar: Sharp and clean, perfect for an old-fashioned Southern profile.
• Sugar: Just enough to balance acidity and bring out the tomatoes.
• Olive Oil: Rounds out the dressing and smooths the vinegar bite.
• Fresh Basil: Optional, but adds freshness and a soft herbal note.

A full ingredient list with exact measurements can be found in the recipe card below.

Substitutions & Variations

• Sugar: Swap for honey or a low-glycemic alternative if needed.
• Vinegar: Apple cider vinegar or red wine vinegar can be used for a slightly different tang.
• Spice: Add a pinch of red pepper flakes for gentle heat.
• Equipment: A large glass bowl works best to prevent reacting with vinegar.
• Presentation: Serve in a shallow dish to showcase the colors.

How To Make Southern Cucumber, Tomato, and Onion Salad

STEP ONE: Prepare the Vegetables

Quarter the Campari tomatoes, slice the mini cucumbers, and thinly slice the red onion.

Add everything directly to a large bowl so the vegetables are ready to be seasoned together.

STEP TWO: Add the Dressing Ingredients

Add the white vinegar, olive oil, garlic, sugar, salt, and black pepper directly over the vegetables.

STEP THREE: Toss and Flavor

Gently toss the vegetables until everything is evenly coated, being careful not to break apart the tomatoes. Add the basil, folding it in lightly.

STEP FOUR: Marinate and Chill

Cover the bowl and refrigerate for at least 30 minutes, or up to 2 hours, so the vegetables fully marinate and the flavors balance.

Toss once more just before serving.

Storage

Store leftover tomato cucumber salad covered in the refrigerator for up to three days. This salad is not freezer-friendly. Serve chilled and toss gently before serving.

Southern Cucumber, Tomato, and Onion Salad FAQs

📖 Recipe

Southern Marinated Cucumber, Tomato, and Onion Salad

Jami Powell

Southern Marinated Cucumber, Tomato, and Onion Salad is a make-ahead friendly, no-cook, summer staple that delivers crisp texture and tangy flavor with almost no effort. This classic Southern cucumber tomato salad recipe uses fresh tomatoes, sliced cucumbers, red onion, and a simple vinegar dressing that marinates in the fridge until everything tastes bright and balanced.

Print Recipe Pin Recipe

Prep Time 15 minutes mins

Cook Time 30 minutes mins

Total Time 45 minutes mins

1x2x3x

Course Salad, Side Dish

Cuisine American, Southern

Servings 4

Calories 256 kcal

Equipment

• ▢
  Large Mixing Bowl
• ▢
  Cutting board
• ▢
  Sharp Knife
• ▢
  Spoon or salad tongs for tossing

Ingredients

  

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• ▢ 6 Campari tomatoes quartered
• ▢ 4 mini cucumbers sliced
• ▢ ⅓ small red onion thinly sliced
• ▢ 2 garlic cloves smashed (left whole)
• ▢ ⅓ cup white vinegar
• ▢ 1½ tablespoons sugar
• ▢ ⅓ cup olive oil
• ▢ 1 teaspoons kosher salt
• ▢ ½ teaspoon black pepper
• ▢ 2 tablespoons fresh basil chopped (optional)

Instructions

 

• Add the quartered Campari tomatoes, sliced mini cucumbers, and red onion to a large bowl.
• Pour the white vinegar evenly over the vegetables, followed by the olive oil. Add in the smashed garlic clove, sugar, kosher salt, and black pepper.
• Gently toss everything together until the vegetables are evenly coated, being careful not to break up the tomatoes.
• Add the chopped basil, folding it in lightly.
• Cover and refrigerate for at least 30 minutes, or up to 2 hours for deeper marinated flavor.
• Give the salad a quick toss before serving and serve chilled.

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Notes

Cooking Notes

Quartering the tomatoes keeps them juicy without causing them to break down. Allowing the salad to rest is key to achieving a balanced flavor. Toss gently before serving to redistribute the dressing.

Tips for Best Results

• Slice vegetables evenly, so they marinate at the same rate.
• Use fresh, firm tomatoes for the  best texture.
• Let the salad rest so flavors develop fully.
• Add herbs at the end to keep them fresh.

How to Know It’s Ready

The onions will soften slightly, the dressing will look glossy, and the vegetables will smell bright and tangy after chilling.

Nutrition

Calories: 256kcalCarbohydrates: 20gProtein: 4gFat: 19gSaturated Fat: 3gPolyunsaturated Fat: 2gMonounsaturated Fat: 13gSodium: 598mgPotassium: 872mgFiber: 5gSugar: 14gVitamin A: 1807IUVitamin C: 36mgCalcium: 70mgIron: 1mg

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