Side Dishes
This Biaggi-inspired cucumber onion salad brings restaurant-quality freshness to your table with just five ingredients and 15 minutes of prep. The secret lies in thinly sliced cucumbers and sharp red onions tossed in a bright, vinegar-kissed dressing that cuts through the summer heat.
I’ve perfected this recipe over years of testing—it’s the kind of side that disappears faster than you can say "second helping."
The magic happens in the dressing ratio: equal parts apple cider vinegar and olive oil, with a pinch of salt and a squeeze of fresh lemon. This balance keeps the salad crisp without sogginess, while the onions add a sharp contrast to the cucumbers’ cool crunch.
It’s simple enough for weeknight dinners but elegant enough for summer gatherings.
What you’ll end up with is a salad that’s vibrant, refreshing, and packed with texture—crisp cucumbers, tangy onions, and a dressing that clings perfectly to each bite. The acidity from the vinegar and lemon awakens the flavors, making every forkful taste like a breath of fresh air.
It pairs beautifully with grilled meats, fish, or even as a light lunch on its own.
Serve it chilled for maximum freshness, and don’t forget the garnish—a sprinkle of fresh dill or a drizzle of extra olive oil takes it to the next level. This salad is your go-to for bright, no-fuss sides that always impress. Let’s get started!
Ingredients for biaggi's cucumber onion salad
Five ingredients. Fifteen minutes. Restaurant-quality freshness on your table.
| Ingredient | Amount | Notes |
|---|---|---|
| Persian Cucumbers 🥒 | 2 whole | Thinly sliced, seeds removed |
| Red Onions 🧅 | 1 whole | Thinly sliced, sharp variety |
| Apple Cider Vinegar 🍏 | ½ cup | Unfiltered preferred for flavor |
| Extra-Virgin Olive Oil 🫒 | ½ cup | Light fruity variety recommended |
| Fresh Lemon Juice 🍋 | 2 tbsp | Freshly squeezed, no pulp |
| Diamond Crystal Kosher Salt 🧂 | ½ tsp | Fine grain preferred |
| Fresh Dill 🌿 | ¼ cup | Chopped, for garnish (optional) |
The cucumbers make or break this salad. Persian cucumbers are ideal—they’re seedless and stay crisp longer. Grab a bunch from Whole Foods or your local farmers market if you can, but the regular grocery store variety works too. Look for cucumbers that are firm and vibrant green—avoid any with soft spots. Red onions are key too; Sweet Red Onions from the store work, but sharper varieties like Tropicana add more bite. Thinly slice both ingredients—about 1/8-inch thick—and let them sit for 10 minutes after slicing to soften slightly. This helps them absorb the dressing better.
No apple cider vinegar? White wine vinegar or rice vinegar works in a pinch, but you’ll lose some depth. The olive oil should be extra-virgin—California Early Harvest or Colavita are my go-tos, but any light fruity variety will do. Fresh lemon juice is non-negotiable—bottled juice lacks the brightness. If you’re short on time, Trader Joe’s sells pre-sliced cucumbers and onions, but they won’t hold up as well. For salt, Diamond Crystal is my preference—it dissolves easily and doesn’t clump. Want extra flavor? Add a pinch of black pepper or a dash of smoked paprika to the dressing.
This salad stays fresh for 3-4 days in the fridge, but the texture is best within the first day. Store the dressing separately if you’re prepping ahead—toss it just before serving. The cucumbers and onions will release water over time, so pat them dry with a paper towel before mixing if you’re making it ahead. For extra crunch, add the dressing right before serving. Garnish with fresh dill or a drizzle of olive oil right before eating—it’s worth the extra minute. Leftovers? Toss them into wraps or grain bowls for a quick lunch the next day.
Why You'll Love This Recipe
- No-Chop Nightmare: I swear by this one when I’m too tired to slice—just slice the cucumbers in half and let the knife do the work. The onions? Thinly sliced, but they soften fast in that bright vinegar-lemon punch, so no lingering bite.
- Tangy Crunch Magic: That first bite of Persian cucumber—so crisp it’s almost loud—paired with the sharp, almost sweet red onion? It’s like summer in your mouth, but make it fancy. The apple cider vinegar and lemon juice cut through the richness of any meal, leaving you wanting more.
- Picnic-Proof Side: Honestly, I’ve packed this in a jar for lunch, tossed it over grilled chicken, and even used it to top a charcuterie board. It’s the kind of salad that doesn’t mind being the star or the supporting act—just throw it where it’s needed.
- Dollar Stretch Wonder: Persian cucumbers and red onions are cheap, and a little olive oil goes a long way. I’ve made this for four people for under $5, and it still feels like a restaurant-worthy dish. Plus, it keeps for days, so no sad, wilted leftovers here.
Step-by-step instructions for Biaggi's cucumber onion salad
This refreshing salad comes together in minutes with crisp ingredients and a tangy dressing.
Prepare the Vegetables
Start by cutting the 2 whole Persian cucumbers in half lengthwise. Scoop out the seeds using a spoon or melon baller—this prevents a watery salad. Then, slice each half into thin half-moons, about ⅛-inch thick. The slices should be even for consistent texture throughout.
Next, peel the 1 whole red onion if you prefer milder flavor, or leave the skin on for extra bite. Thinly slice the onion into half-moons, similar to the cucumbers. Soak the sliced onions in a bowl of ice water for 5 minutes to mellow their sharpness while you finish prepping the other ingredients. Drain well before using.
Whisk the Dressing
In a medium bowl, combine the 0.5 cup apple cider vinegar and 2 tablespoons fresh lemon juice. Stir well to blend the tangy flavors. Then, gradually whisk in the 0.5 cup extra-virgin olive oil while continuing to stir. This creates an emulsified dressing that won't separate.
Add the 0.5 teaspoon diamond crystal kosher salt and mix until fully dissolved. Taste the dressing—it should be bright and slightly acidic. If you prefer more tang, add an extra splash of lemon juice. Keep this dressing aside until you're ready to combine everything.
Combine Ingredients
In a large mixing bowl, gently combine the sliced cucumbers and drained onions. Add the 0.25 cup fresh dill, chopped into small pieces. The dill adds a fresh herbal note that balances the sharpness of the onions and the crispness of the cucumbers.
Pour the dressing over the vegetables and toss gently with a wooden spoon or clean hands. Be careful not to bruise the cucumbers—they should remain crisp and bright. Taste a bite and adjust seasoning if needed, adding more salt or lemon juice to your preference.
Chill and Serve
Cover the salad and refrigerate for at least 30 minutes before serving. This allows the flavors to meld and the dressing to penetrate the vegetables. The salad will be even more refreshing after chilling.
When ready to serve, give the salad one final toss to redistribute the dressing. Garnish with extra dill if desired, and serve immediately. This salad pairs beautifully with grilled meats, fish, or as a light vegetarian dish on its own.
Pro Tips For Making Biaggi'S Cucumber Onion Salad
- Soak Onions 15 Minutes: Skip the rush—slice those red onions thin and let them sit in cold water for at least 15 minutes before draining. This softens the bite just enough to keep the salad from tasting harsh, especially if you’re using a sharp or slightly sweet onion. (Yes, I know it feels like waiting, but trust me on this.)
- Dry Cucumbers Thoroughly: Pat those Persian cucumbers completely dry with a kitchen towel after slicing—no wet spots. Extra moisture makes the salad soggy fast, and nobody wants a watery mess when the olive oil is supposed to be the star. I learned this after serving a salad that looked more like a drink by lunchtime.
- Balance Vinegar First: Taste the raw vinegar before adding lemon—start with half the recipe’s apple cider vinegar, then adjust. The acidity can sneak up on you, and you’ll end up with a salad that tastes like you’re pickling the cucumbers instead of serving them fresh. (I’ve been there. Twice.)
- Whisk Oil and Vinegar: Don’t just dump the olive oil and vinegar in—whisk them together before tossing with the veggies. This creates an emulsion that coats everything evenly, so you get that bright, cohesive flavor in every bite instead of oily patches. Sounds fussy, but it’s two seconds of work that makes a real difference.
Common mistakes when making this dish
Over-Slicing Cucumbers
Thinly slicing cucumbers is key, but going too thin—less than ⅛-inch—turns them into mush when tossed with dressing. I’ve made this mistake when rushing, and the result is a sad, watery salad.
Use a sharp chef’s knife and keep slices even. If you’re unsure, practice on a spare cucumber first. 🥒
Skipping Onion Soak
Raw red onions can overpower the salad with sharpness. Skipping the 5-minute ice water soak leaves them too harsh. I learned this the hard way at a summer BBQ—guests loved the concept but couldn’t finish their plates! Drain well after soaking to avoid excess water in your salad.
Using Bottled Lemon Juice
Fresh lemon juice is non-negotiable for brightness. Bottled juice lacks the acidity and often contains additives. I once used bottled juice in a hurry, and the salad tasted flat. If you’re short on time, use Trader Joe’s fresh-squeezed lemon juice packets—they’re a decent shortcut. 🍋
Over-Tossing the Salad
Gentle tossing is crucial—over-mixing bruises cucumbers, releasing bitter-tasting seeds and water. I’ve ruined batches by being too vigorous. Use a wooden spoon or clean hands to combine ingredients lightly. The dressing should coat the veggies without crushing them.
Not Chilling Before Serving
Serving this salad immediately means the flavors won’t meld properly. The 30-minute chill time lets the dressing penetrate the vegetables, enhancing their crispness. I once served it straight from the bowl, and it lacked the refreshing balance I knew it could have.
Ignoring the Dressing Ratio
The equal parts apple cider vinegar and olive oil create the perfect balance. Using too much oil makes it greasy, while too much vinegar can overwhelm. I’ve messed this up by eyeballing measurements—always measure! Taste as you go to adjust the acidity or richness. ✨
Nutrition facts
Frequently asked questions
Can I use regular cucumbers instead of Persian cucumbers?
Yes, you can! Regular cucumbers work fine, but you’ll need to remove all the seeds to prevent excess water in your salad. The key is thin slicing (⅛-inch) and patting them dry before tossing with dressing. Persian cucumbers are ideal because they’re seedless and stay crisp longer, but regular ones will still give great results if prepped carefully.
How do I make this salad less spicy?
If the onions are too sharp, soak the sliced onions in ice water for 10-15 minutes instead of just 5. For extra mildness, peel the onions before slicing. You can also reduce the onion quantity by half if you prefer. The dressing ratio remains the same—just adjust the veggie proportions to taste.
Can I make this ahead of time?
Store the dressing separately and mix it with the vegetables just before serving to keep them crisp. The cucumbers and onions will release water over time, so pat them dry and store them in an airtight container for up to 2 days. The salad tastes best within the first day, though—flavors meld beautifully when made fresh.
What are the best ways to serve this salad?
This salad pairs perfectly with grilled meats like chicken or steak, or as a light vegetarian main with crusty bread. For extra flair, serve it in a hollowed-out cucumber or on a bed of mixed greens. It’s also fantastic as a topping for tacos or grain bowls. The bright acidity cuts through rich dishes beautifully.
Can I substitute apple cider vinegar?
Yes, but your flavor will change slightly. White wine vinegar or rice vinegar work in a pinch, though apple cider adds depth. For a fruity twist, try balsamic vinegar (reduce the amount by half) or lemon juice (add 1 extra tablespoon). Always taste as you go—adjust the lemon juice to balance the acidity.