This crisp cucumber and tomato salad features a simple, zippy summer vinaigrette that doubles as a vibrant marinade for your favorite grilled meats.
- Osmotic Balance: A tiny pinch of sugar chemically buffers the sharp white vinegar without masking the clean, grassy notes of the cucumbers.
- Emulsion Stability: Shaking the dressing vigorously in a jar temporarily suspends the oil and vinegar, ensuring it clings to the vegetables instead of sliding off.
- Roma Tomato Integrity: Roma tomatoes have lower water content and thicker walls, preventing the salad from turning into a soggy, watery soup.
I still remember standing by my grandmother's screen door in late July, the heavy humid air smelling of damp earth and bruised tomato leaves while she scraped a metal spoon against a worn plastic bowl. She would slice cucumbers so thin they were practically translucent, splashing them with whatever cheap white vinegar she had in the pantry.
It was simple, raw, and absolutely perfect.
While she kept things minimalist, I prefer a bit more structure. This version brings together crisp English cucumbers, meaty Roma tomatoes, and a sharp onion bite, all tied together with a pantry-staple vinaigrette.
The real magic here lies in managing the water content of your vegetables. Cucumbers and tomatoes are packed with water held inside their cells by turgor pressure; the moment you introduce salt, osmosis kicks in and coaxes those juices out. By using Roma tomatoes—which have fewer seeds and sturdier walls than beefsteaks—and leaving the skin on the English cucumbers, we keep the salad remarkably crunchy instead of letting it collapse into a watery puddle.
Do not peel those cucumbers.
For the salt, I always reach for Diamond Crystal kosher salt — 1 tsp = ½ tsp table salt, because the flakes are larger and lighter, making it incredibly easy to season precisely without overdoing it. I tested this dressing with fancy extra-virgin olive oils, but honestly, a neutral oil or a basic vegetable oil works best here because it lets the sharp, clean punch of the white vinegar shine through.
If you have leftovers, they make a fantastic side alongside some Crispy Fried Zucchini or a warm scoop of Squash Casserole. After twenty-four hours in the fridge, the onions lose their harsh sulfurous bite and turn sweet and pickled.
Cucumber & Tomato Salad with Simple Summer Vinaigrette
Ingredients
- 2 English cucumbers, cut into bite-sized half-moons
- 6-8 Roma tomatoes, cut into bite-sized wedges
- 1 large onion, sliced thin
- 1/2 cup neutral oil (such as canola or vegetable oil)
- 1/4 cup white vinegar
- 1/2 teaspoon Diamond Crystal kosher salt
- 1/2 teaspoon freshly cracked black pepper
- 1/2 teaspoon granulated sugar
Directions
- Wash the English cucumbers and Roma tomatoes thoroughly under cold water; slice the cucumbers into bite-sized half-moons (leave the skin on for maximum crunch) and cut the tomatoes into similar-sized wedges.
- Peel the large onion, slice it into thin strips or chop it into bite-sized pieces, and toss it into a large mixing bowl along with the prepared cucumbers and tomatoes.
- In a small Mason jar or a lidded container, combine the neutral oil, white vinegar, kosher salt, freshly cracked black pepper, and granulated sugar.
- Secure the lid tightly and shake the jar vigorously for 15 to 20 seconds until the dressing is temporarily emulsified and cloudy.
- Pour the vinaigrette over the vegetables and use your hands or a pair of wooden spoons to gently toss everything together until every piece is coated.
- Let the salad sit at room temperature for 10 minutes before serving to allow the flavors to meld and the salt to draw out just enough sweet tomato juice to mingle with the dressing.
Notes
Keep these essential tips in mind to ensure your summer salad stays crisp and perfectly balanced:
- Salt Conversion: This recipe specifies Diamond Crystal kosher salt. If you are using standard table salt or fine sea salt, reduce the amount to 1/4 teaspoon to prevent the salad from becoming overly salty.
- The Science of Sugar: The 1/2 teaspoon of sugar is not meant to make the dressing sweet; instead, it acts as a chemical buffer that softens the harsh acetic acid of the white vinegar, rounding out the overall flavor profile.
- Avoid the Soggy Slurry: Do not dress this salad more than an hour before serving if you want maximum crunch. Osmosis will continuously draw water out of the cucumbers, which dilutes the dressing over time.
- Storage Wisdom: Leftovers can be stored in an airtight container in the fridge for up to 3 days, though the vegetables will soften. The leftover seasoned juice at the bottom of the bowl is gold—use it to dip crusty bread.
- Marinade Variation: If you want to use this vinaigrette as a marinade for chicken or pork chops, double the dressing ingredients and let the meat marinate for at least 4 hours.
Serving Suggestions
This bright, acidic salad pairs beautifully with rich, savory dishes that need a crisp counterpoint. Here are some of our favorite ways to serve it:
- Textural Contrast: Serve this ice-cold salad next to hot, crunchy Crispy Fried Zucchini to contrast the cool, juicy vegetables with a warm, crispy batter.
- Cookout Pairing: Pair it with a rich, creamy side like The BEST Creamy Macaroni Salad to cut through the heavy mayo base with bright, acidic vinaigrette.
- Southern Feast: Serve alongside a comforting bowl of Squash Casserole for a vegetable-forward summer dinner that feels like a warm hug.
- Alternative Salad Spread: Set it up on a buffet alongside a sweet Grape Salad to give your guests both savory-acidic and sweet-creamy options.
Storage and Reheating
This salad is at its absolute peak about ten minutes after tossing, when the salt has just begun to coax out the tomato juices but the cucumbers still retain their full turgor pressure. If you leave it sitting on the counter during a hot backyard cookout, the vegetables will slowly weep, pooling a delicious, tangy liquid at the bottom of the bowl.
Store any leftovers in a glass airtight container in the refrigerator for up to three days. Do not freeze this salad; the freezing process destroys the plant cell walls, turning your crisp cucumbers and tomatoes into a mushy, unappealing slurry once thawed.
Over twenty-four hours, the raw onion slices will lose their sharp, sulfurous bite as they essentially quick-pickle in the vinegar dressing. The cucumbers will lose some of their snap, but they absorb the vinaigrette deeply, making them incredibly flavorful.
Before serving leftover salad, give the container a vigorous shake or a thorough stir with a spoon to re-emulsify the oil and vinegar that separated overnight. You can also fish out the vegetables with a slotted spoon if you prefer a less wet salad, but make sure to save that leftover dressing for marinating chicken later.
Ingredient Substitutes
If you do not have the exact ingredients on hand, these simple swaps will keep your salad on track without losing its signature brightness:
- English Cucumbers → Persian Cucumbers: Swap the 2 English cucumbers for 4-5 Persian cucumbers; they have the same thin skin and low seed count, so no peeling or seeding adjustments are necessary.
- Roma Tomatoes → Cherry Tomatoes: Replace the 6-8 Roma tomatoes with 2 cups of halved cherry or grape tomatoes; this swap actually reduces water release even further because the skin holds the juices in.
- White Vinegar → Red Wine Vinegar: Substitute the 1/4 cup of white vinegar with 1/4 cup of red wine vinegar or apple cider vinegar for a mellower, slightly fruitier acid profile without changing the liquid ratio.
- Neutral Oil → Extra-Virgin Olive Oil: Swap the 1/2 cup of neutral oil for a high-quality extra-virgin olive oil; keep in mind that olive oil can solidify in the fridge, so you will need to let the salad sit at room temperature for 15 minutes before serving to liquefy the oil.
- Granulated Sugar → Honey or Maple Syrup: Replace the 1/2 teaspoon of sugar with 1/2 teaspoon of honey or maple syrup; whisk it thoroughly into the vinegar before adding the oil to ensure it dissolves completely.
This simple salad is a testament to the power of basic pantry staples when paired with fresh, seasonal produce. Keep a jar of this vinaigrette in your fridge all summer long, and you will always be minutes away from a bright, crunchy side dish. It is uncomplicated, honest food at its finest.
