Salads
Biaggi's cucumber onion salad recipe delivers that perfect balance of crisp, refreshing textures and bright, tangy flavors that elevate any meal. ✨ The secret lies in the zesty dill vinaigrette—a harmonious blend of vinegar, oil, and fresh herbs—that transforms simple cucumbers and onions into a restaurant-worthy side dish.
This classic salad is deceptively simple, yet the careful balance of acidity, freshness, and crunch makes it unforgettable.
The foundation of this salad is thinly sliced cucumbers and finely diced red onions, which create a satisfying contrast in both texture and flavor.
A light dressing of olive oil, red wine vinegar, Dijon mustard, and fresh dill ties everything together, adding a bright, herby note that cuts through the richness of any main dish.
The key is letting the salad sit for at least 15 minutes before serving, allowing the flavors to meld and the onions to soften just enough to become tender without losing their bite.
What you’ll end up with is a crisp, vibrant salad that’s as refreshing as it is flavorful—perfect for summer gatherings, picnics, or as a side to grilled meats and seafood. The dressing clings to every slice, enhancing the natural sweetness of the cucumbers and the sharpness of the onions.
This recipe is adaptable, too, so you can adjust the herbs or add a squeeze of lemon for extra brightness if you prefer.
Whether you're serving this salad at a backyard barbecue or as a light lunch, its bright flavors and crisp textures make it a standout dish. The simplicity of the ingredients belies the depth of flavor, proving that sometimes the best recipes are the ones that don’t overcomplicate. Let’s get started!
Ingredients for biaggi's cucumber onion salad
Crisp cucumbers, tangy onions, and herby vinaigrette—this salad is summer magic in a bowl!
| Ingredient | Amount | Notes |
|---|---|---|
| Persian Cucumbers 🥒 | 2 lb | Thinly sliced, seeds removed |
| Red Onions 🧅 | 1 whole | Finely diced, soaked 10 mins |
| Fresh Dill 🌿 | ½ cup | Chopped, stems removed |
| Extra-Virgin Olive Oil 🫒 | ½ cup | Light fruity variety |
| Red Wine Vinegar 🍷 | ¼ cup | Balsamic works too |
| Dijon Mustard 🥫 | 1 tbsp | Mellow flavor preferred |
| Granulated Sugar 🍚 | 1 tsp | Balances acidity |
| Kosher Salt 🧂 | ½ tsp | Diamond Crystal preferred |
| Fresh Lemon Juice 🍋 | 1 tbsp | Optional brightness |
| Black Pepper 🌶️ | ¼ tsp | Freshly cracked |
| Toasted Walnuts 🥜 | ¼ cup | Chopped, optional crunch |
The cucumbers are everything here. Persian cucumbers (the small, seedless kind) slice up beautifully and stay crisp longer than regular cucumbers. Grab them from the produce section—Whole Foods or Trader Joe's usually have the best selection. If you can't find Persian, regular cucumbers work, but you'll need to remove more seeds. For the onions, red onions give that perfect sweet-tangy bite, but yellow onions in a pinch will work too. Just soak them in cold water for 10 minutes before adding to the salad—this mellows their sharpness without cooking them. The dill? Fresh is non-negotiable—dried just won't cut it here. Look for bright green stems at the market, and chop it right before mixing everything together.
No red wine vinegar? Apple cider vinegar works in a pinch, though it'll be slightly sweeter. Dijon mustard is key for that little tang, but yellow mustard at half the amount gets you close. The sugar might seem odd, but trust me—it balances the acidity beautifully. No sugar? A pinch of honey (if you're not strict vegan) or just skip it. The walnuts are optional but add that perfect crunch. Toast them in a dry pan for 3-4 minutes until golden—don't walk away, or they'll burn. For extra brightness, that lemon juice is your secret weapon. No fresh lemon? Bottled lemon juice works, but it'll lack that pop. And if you're feeling fancy, add a few thinly sliced radishes for color and peppery bite.
This salad keeps beautifully—3-4 days in the fridge if stored in an airtight container. The flavors actually get better after sitting overnight as everything mellows together. For serving, I like to portion it into glass bowls with a slotted spoon so people can serve themselves. The dressing will separate a bit, so give it a quick stir before tossing. If you're prepping ahead, make the dressing separately and store it in a jar—just shake it up before using. The cucumbers will get slightly softer over time, but the flavor only improves. And if you make extra? It disappears fast at parties—always a good sign!
Why You'll Love This Recipe
- No-Chop Nightmare: I swear, the Persian cucumbers slice themselves—just a knife and a few quick strokes, no mandoline required. That red onion? Toss it in whole, let the vinegar do the work later. Honestly, I’ve made this while waiting for dinner to cook.
- Tangy Crunch Magic: The red wine vinegar cuts through the cucumbers’ sweetness like a summer breeze, while the dill adds that bright, herbal punch. Between us, the olive oil ties it all together—rich but not heavy, with that just-right bite.
- Picnic Party Ready: Pack it in a jar for lunch, toss it on grilled chicken for dinner, or serve it alongside charcuterie—this salad always steals the show. I’ve taken it to BBQs, potlucks, and even lazy Sundays, and it never lets me down.
- Lasts All Week: Make a big batch on Sunday, and it’ll still taste fresh by Thursday. The onions mellow out, the dill stays bright, and the dressing keeps it from getting soggy. Budget win: cucumbers and onions are cheap, but it feels like a fancy side.
Step-by-step instructions for Biaggi's cucumber onion salad
Here's how to assemble this refreshing, zesty salad with restaurant-quality balance.
👨🍳 Step 1: Prep the Vegetables with Precision
Start with the 2 lb Persian cucumbers—slice them thinly on a mandoline or sharp knife, removing seeds if they're large. You want ¼-inch thick slices for even texture. Transfer to a large colander and sprinkle with ½ teaspoon kosher salt—this draws out excess water. Let sit for 10 minutes while you prep the onions.
For the 1 whole red onion, finely dice it and place in a small bowl. Cover with cold water and let soak for 10 minutes to mellow the sharpness. Drain well before using—this step makes all the difference in flavor balance. Real talk: skipping this soak means a bite that's too sharp to enjoy the salad's bright qualities.
🥘 Step 2: Create the Signature Dill Vinaigrette
In a medium bowl, whisk together the 0.5 cup extra-virgin olive oil, 0.25 cup red wine vinegar, 1 tablespoon Dijon mustard, 1 teaspoon granulated sugar, and 0.25 teaspoon black pepper. The sugar might seem odd, but it rounds out the acidity beautifully. Whisk until fully emulsified—this should take about 30 seconds of steady whisking.
Add the 0.5 cup chopped fresh dill and 1 tablespoon fresh lemon juice (if using) and give it one final stir. Taste and adjust—you want a balance of tangy, herby, and slightly sweet. Here's the thing: the vinaigrette should coat the back of a spoon but still pour easily. If it's too thick, add 1 teaspoon water at a time until it reaches the right consistency.
🍳 Step 3: Combine and Dress the Salad
Drain both the cucumbers and onions thoroughly, giving them a good shake to remove excess moisture. In a large mixing bowl, gently combine the cucumbers and onions. Add the toasted walnuts (if using) and toss lightly—just enough to distribute them evenly without breaking them apart. You want that satisfying crunch in every bite.
Pour the vinaigrette over the vegetables and toss gently with clean hands or a large spoon. The key here is to work quickly but carefully—you don't want to bruise the cucumbers. Taste again and adjust seasoning if needed. Remember, the salad will continue to mellow as it sits, so don't over-salt at this stage. Let it rest for 10 minutes before serving to allow flavors to meld.
⏰ Step 4: Serve Immediately for Peak Freshness
Transfer the salad to a serving platter and give it one final gentle toss. The ideal serving temperature is cool but not cold—this salad shines when served immediately after assembly. The cucumbers should still have a slight bite, the onions should be sweet and mild, and the walnuts should provide satisfying crunch with every bite.
For the best experience, serve this salad within 2 hours of preparation. If storing, keep it refrigerated in an airtight container and toss again before serving. The flavors actually improve slightly after chilling, but the texture is best when served fresh. This salad pairs perfectly with grilled meats, rich cheeses, or as a light lunch on its own.
Pro Tips For Making Biaggi'S Cucumber Onion Salad
- SOAK ONIONS 15 MINUTES: I learned this the hard way—skipping the soak makes red onions taste harsh no matter how thinly you slice. Toss the cut onions in cold water for 15 minutes, then drain. The bitterness fades, and the salad stays bright instead of turning mushy.
- SLICE CUCUMBERS THICK: Thin slices bruise fast and turn watery. Cut Persian cucumbers into ¼-inch thick half-moons instead—thicker pieces hold shape longer and keep that crisp bite. No, they won’t look like matchsticks, but they’ll taste better.
- SALT DILL BEFORE CHOPPING: Sprinkle dill with a pinch of salt, let it sit 2 minutes, then chop. The leaves soften slightly, releasing more flavor when mixed into the dressing. (Yes, even if you’re impatient like me—just don’t skip it.)
- DRESS SALAD LAST MINUTE: This isn’t a make-ahead dish. Toss cucumbers, onions, and dill with olive oil and vinegar right before serving—otherwise, the cucumbers turn limp and the onions dull. Wait 10 minutes max, then eat it fresh.
Storing and reheating your leftovers
Refrigerator Storage
Store your Biaggi-inspired cucumber onion salad in an airtight glass container (I use Pyrex) for up to 3-4 days. The flavors actually deepen as the ingredients mellow together—this is why many chefs recommend making it ahead.
Just be sure to drain any excess liquid that collects before sealing. The cucumbers will soften slightly but stay crisp enough to enjoy. 🥒
Freezer-Friendly Dressing
While the full salad doesn't freeze well, the dill vinaigrette keeps beautifully for up to 1 month in a sealed jar. Store it in the freezer, and when ready to use, let it thaw in the fridge overnight.
Shake vigorously before using—it may separate slightly. This is a game-changer for meal prep, as you can assemble the salad fresh while using pre-made dressing. 🥫
Reheating for Best Texture
This salad is best served fresh, but if you must reheat, focus on the dressing. Warm the vinaigrette separately by whisking it in a bowl over hot (not boiling) water for 2-3 minutes.
Then toss it gently with the chilled salad components. The cucumbers will stay crispest when kept cold, while the dressing regains its emulsified texture. Never microwave the full salad—the heat destroys the crispness. ❄️
Make-Ahead Tips
Prep the vegetables and dressing separately the night before. Store them in separate airtight containers in the fridge. When ready to serve, combine everything just before eating. This method preserves the crunch and brightness perfectly.
I often do this for parties—it's a huge time-saver and still tastes restaurant-fresh. The key is keeping the components dry and refrigerated until the last possible moment. 💡
Portioning for Parties
For gatherings, portion the salad into individual glass bowls with slotted spoons. This lets guests serve themselves without soggy bottoms. Store any leftovers in the fridge and toss with fresh dressing before serving.
The salad keeps its vibrant colors and crisp texture for up to 24 hours when stored this way. Trust me, your guests will notice the difference! 🍽️
Nutrition facts
Frequently asked questions
Can I use regular cucumbers instead of Persian cucumbers?
Yes, but you'll need to remove more seeds and slice them slightly thicker (⅛-inch instead of ¼-inch) to maintain crispness. Persian cucumbers stay crunchier longer because they have fewer seeds and thicker skin. If using regular cucumbers, pat them extra dry after salting to prevent a watery salad.
How do I adjust the dressing for a milder onion flavor?
Skip the onion soak and use only ½ of the diced onion (about ¼ cup instead of ½ cup). For extra sweetness, add ½ teaspoon honey to the dressing. The key is balancing the sharpness with more sugar (up to 1.5 teaspoons) and a splash of lemon juice. Taste as you go!
What's the best way to store leftovers without soggy cucumbers?
Drain excess liquid thoroughly before storing, then layer cucumbers and onions in an airtight container with paper towels between layers. Keep the dressing separate until ready to serve. Refrigerate for up to 3 days—the salad will keep its texture better this way. When serving, toss with fresh dressing just before eating.
Can I make this salad ahead of time for a picnic?
Assemble the salad 2-3 hours ahead and store it in a sealed container. The flavors meld beautifully, and the onions soften perfectly. For picnics, pack the dressing separately and mix just before serving. Use an insulated cooler with ice packs to keep it chilled during transport. Pro tip: Add radishes or mint right before serving for extra freshness.
What if my dill vinaigrette separates?
This happens when oil and vinegar aren't properly emulsified. Whisk vigorously or use a fork to recombine. For stubborn separation, add 1 teaspoon warm water or ½ teaspoon Dijon mustard and whisk again. If it's still too thick, thin with 1 teaspoon vinegar. The salad will still taste great—just give it a quick stir before serving.