Salads
This cucumber onion salad with white sauce recipe delivers crisp, refreshing bites that balance sharp onions, cool cucumbers, and a creamy dressing in just 15 minutes.
The secret lies in thinly slicing the vegetables for maximum crunch and pairing them with a tangy white sauce that coats every bite without overpowering the freshness.
I created this dish after realizing how often simple salads get overlooked in favor of heavier meals—it’s the perfect light lunch or side for summer gatherings.
The white sauce is the star here, made with a base of mayonnaise, sour cream, and a touch of lemon juice for brightness. This combination creates a velvety texture that clings to the vegetables while keeping the salad light enough to enjoy on its own.
Thinly sliced red onions add a sharp contrast, while crisp cucumber slices provide that signature refreshing crunch. The result is a dish that’s both elegant and effortless, requiring no special skills—just a knife, a bowl, and a few simple ingredients.
What makes this salad truly special is how quickly it comes together while delivering restaurant-quality texture. The white sauce binds everything without making it heavy, and the crisp vegetables ensure every bite stays fresh. This dish is perfect for potlucks, picnics, or as a refreshing starter before a heartier meal.
The flavors are clean, the prep is straightforward, and the result is a salad that feels indulgent yet remains light and satisfying.
For extra flair, garnish with fresh dill or a sprinkle of black pepper before serving. The sauce can be adjusted to suit dietary preferences—swap mayo for Greek yogurt for a lighter version, or use vegan mayo for a plant-based option.
Whether you’re feeding a crowd or treating yourself to a light lunch, this salad delivers crisp refreshment without the fuss.
Ingredients for cucumber onion salad white sauce
Fresh vegetables meet velvety white sauce in this crisp, refreshing cucumber onion salad.
| Ingredient | Amount | Notes |
|---|---|---|
| Persian Cucumbers 🥒 | 2 cups | Thinly sliced lengthwise for crunch |
| Red Onions | 1 medium | Thinly sliced, soak 5 mins to mellow |
| Mayonnaise 🥛 | ½ cup | High-quality preferred for creaminess |
| Sour Cream 🧀 | ¼ cup | Full-fat for best texture |
| Fresh Lemon Juice 🍋 | 2 tbsp | Freshly squeezed for brightness |
| Extra-Virgin Olive Oil 🫒 | 1 tbsp | For richness and balance |
| Granulated Sugar 🍯 | 1 tsp | Balances acidity in sauce |
| Fresh Dill 🌿 | 2 tbsp | Chopped, for garnish and flavor |
| Salt 🧂 | ½ tsp | Kosher or sea salt preferred |
| Freshly Ground Black Pepper 🌶️ | ¼ tsp | For subtle heat |
| Red Wine Vinegar 🍷 | 1 tbsp | For tangy depth |
| Garlic Cloves 🧄 | 1 clove | Minced for subtle flavor |
The cucumbers should be Persian-type for their thin skin and crisp texture. Local farmers markets often carry them in summer, but any seedless cucumber works in a pinch. Red onions are key—sweet varieties like Vidalia add natural sweetness, while sharper types like red or yellow work well too. Soak the sliced onions in cold water for 5 minutes to mellow their bite before draining. For the white sauce base, Duke's or Hellmann's mayo delivers consistent quality, but any high-quality brand works. The sour cream should be full-fat for that signature velvety texture—Kroger or Trader Joe's organic options are excellent choices.
No red wine vinegar? Apple cider vinegar at the same amount works perfectly. Short on fresh dill? Dried dill at one-third the amount suffices, though fresh is always better. Want to lighten the sauce? Swap half the mayo for Greek yogurt or vegan mayo. The garlic can be omitted if you dislike its flavor, but it adds subtle depth. For extra crunch, add 1/4 cup thinly sliced radishes. This salad keeps its crispness best when assembled just before serving—no wilting guaranteed.
This salad holds in the fridge for up to 2 days, though the onions may soften slightly. Store the sauce and vegetables separately, then toss before serving. Garnish with fresh dill and a sprinkle of black pepper right before eating. For a crowd, double the recipe—prep all components ahead, then assemble last minute. The sauce can be made 1 day ahead and stored separately for up to 3 days in an airtight container.
Why You'll Love This Recipe
- No-Fuss Assembly: I swear, this comes together in five minutes—just chop the cucumbers into thick half-moons, slice the onions paper-thin, and fold them into that tangy white sauce. No peeling, no seeding, no fuss. The onions soften just enough to mellow out their bite while keeping that satisfying crunch from the cucumbers.
- Tangy Creamy Magic: That combo of mayo and sour cream gives it this velvety richness, but the lemon juice? Oh, it’s the star—brightens everything up so it’s never heavy. Honestly, the first time I tasted it, I grabbed the bowl and ate it straight from the fridge. (Don’t judge me.)
- Picnic Party Starter: Between us, this is my go-to for potlucks, barbecues, or even a lazy Sunday spread. It’s cool, refreshing, and pairs with everything—grilled chicken, sandwiches, or just straight up with crackers. Plus, it stays crisp in the heat, so no soggy surprises.
- Budget-Friendly Pantry Hero: I make this at least once a week because it’s dirt cheap—Persian cucumbers and onions are usually on sale, and mayo/sour cream stretch forever. Leftovers? They last five days in the fridge, and honestly, they taste even better the next day once the flavors meld. My wallet and my taste buds win.
Step-by-step instructions for cucumber onion salad with white sauce
This refreshing salad comes together in minutes with crisp vegetables and a creamy dressing.
Prepare the Vegetables
Begin by slicing the 2 cups Persian cucumbers lengthwise into thin strips using a sharp knife. The cucumbers should be about ¼-inch thick for maximum crunch. Place them in a large mixing bowl immediately after slicing to prevent browning.
Next, thinly slice the 1 medium red onion into half-moon shapes. Transfer the sliced onions to a small bowl and cover them with cold water. Let them soak for 5 minutes to mellow their sharpness. Drain and pat dry with a paper towel before adding to the cucumbers. This step ensures the onions won't overpower the salad with their bite.
Make the White Sauce
In a separate medium bowl, combine the 0.5 cup mayonnaise and 0.25 cup sour cream using a whisk or fork. The mixture should be smooth and fully incorporated. Add the 2 tbsp fresh lemon juice, 1 tbsp extra-virgin olive oil, 1 tsp granulated sugar, 1 tbsp red wine vinegar, and 1 minced garlic clove. Whisk until everything is well blended and the sugar has fully dissolved.
Season the sauce with 0.5 tsp salt and 0.25 tsp freshly ground black pepper. Taste and adjust the seasoning if needed—you may want to add a touch more lemon juice or salt to balance the flavors. The sauce should be tangy, slightly sweet, and perfectly seasoned.
Combine and Chill
Add the drained cucumbers and onions to the bowl with the sauce. Gently toss everything together using a large spoon or spatula, making sure the vegetables are evenly coated. The salad should look vibrant with a creamy sheen from the dressing.
Transfer the salad to an airtight container and refrigerate for at least 15 minutes before serving. This brief chilling time allows the flavors to meld together, ensuring each bite is perfectly balanced. The salad will keep well in the refrigerator for up to 2 days, making it ideal for meal prep.
Garnish and Serve
Before serving, give the salad one final toss to redistribute the dressing. Sprinkle the 2 tbsp chopped fresh dill evenly over the top for a pop of color and fresh flavor. The dill adds a bright, herby note that complements the creamy dressing and crisp vegetables.
Serve the salad immediately as a refreshing side dish or light meal. It pairs beautifully with grilled meats, sandwiches, or as a standalone dish for warm weather gatherings. The contrast of crisp cucumbers, tangy onions, and creamy dressing makes every bite satisfying.
Pro Tips For Making Cucumber Onion Salad White Sauce
- Slice Onions Thin: I learned this the hard way—thick onion slices make the salad taste like a mouthful of cardboard. Use a sharp knife and cut them paper-thin, then soak in cold water for 10 minutes to mellow the bite. Trust me, your taste buds will notice the difference.
- Mix Sauce Last: Tossing the mayo and sour cream too early turns the dressing into a watery mess. Whisk them together right before adding to the cucumbers and onions—this keeps the texture creamy and the salad from getting soggy. (Yes, even if you're impatient like me.)
- Salt the Cucumbers: Skip this, and your salad will taste bland. Sprinkle a pinch of salt over the sliced cucumbers and let them sit for 5 minutes before draining. It pulls out excess water and sharpens the flavor—no one wants a sad, watery salad.
- Lemon Juice First: Sounds weird, but it works: mix the lemon juice into the mayo-sour cream blend before adding it to the veggies. This keeps the sauce from curdling and gives the whole salad a brighter, more cohesive taste. (Your future self will thank you.)
Pro cooking tips for perfect results
Knife Skills Matter
Thin, even slices are the secret to this salad’s crisp texture. Use a sharp chef’s knife and slice the cucumbers lengthwise into ¼-inch strips—never round slices, which turn mushy. For onions, cut into thin half-moons (like French fries) and soak in cold water for 5 minutes to remove sharpness.
A mandoline slicer (like the OXO Good Grips) makes this step foolproof for perfect uniformity every time. 🔪
Sauce Consistency Tips
The white sauce should coat the vegetables without making them soggy. If it’s too thick, whisk in 1 tsp cold water at a time until it reaches a light drizzle consistency. For extra creaminess, chill the sauce for 10 minutes before mixing—this firms up the mayo and sour cream.
I’ve found Duke’s mayo works best here, but Hellmann’s is a close second. Avoid low-fat mayo, as it separates and ruins the texture. 🥛
Preventing Wilting
Cucumbers and onions wilt quickly when exposed to air. After slicing, toss them immediately with the sauce and store in an airtight container (I use Glasslock containers).
For extra crispness, add the vegetables to the sauce just before serving—this keeps them vibrant for up to 2 hours at room temperature. If prepping ahead, store the sauce and veggies separately and combine right before eating. ❄️
Flavor Balancing Tricks
The sauce’s tang-sweet balance is key. If it tastes too sharp, add ½ tsp sugar or 1 tsp honey. Too bland? Boost with ½ tsp Dijon mustard or an extra ½ tsp lemon juice.
For depth, infuse the olive oil with 1 crushed garlic clove for 10 minutes before adding it to the sauce. Taste as you go—this salad’s magic lies in its harmony of flavors. 💫
Garnish Like a Pro
Fresh dill isn’t just for looks—it adds bright, herby contrast. Chop 2 tbsp dill and sprinkle it over the salad right before serving to preserve its aroma. For extra flair, add crushed black pepper or a pinch of smoked paprika for warmth.
A drizzle of high-quality olive oil (like California Extra Virgin) adds a luxurious finish. 🌿
Make-Ahead Hacks
Prep the sauce 1 day ahead and store it in an airtight container in the fridge. Slice the cucumbers and onions 4 hours ahead, but don’t mix them with the sauce until serving.
For a crowd, assemble the salad in layers: sauce at the bottom, veggies on top, then garnish. This keeps everything crisp and prevents sogginess. The flavors actually improve overnight! 📅
Nutrition facts
Frequently asked questions
Can I make this salad without mayo for a lighter version?
Swap the mayo for ½ cup Greek yogurt or vegan mayo to cut calories while keeping the creamy texture. For extra tang, add 1 tbsp lemon juice or apple cider vinegar to balance the richness. The salad will still hold its crispness and flavor beautifully.
How do I keep the cucumbers extra crisp for serving?
Slice the cucumbers just before mixing with the sauce to prevent wilting. For maximum crunch, store the sliced veggies and sauce separately in an airtight container (like Glasslock) and combine 30 minutes before serving. Add a pinch of salt to the cucumbers while prepping to draw out excess moisture.
What’s the best way to adjust the sauce if it’s too thick?
Whisk in 1 tsp cold water at a time until the sauce reaches a light drizzle consistency. If it’s still too thick, add ½ tsp lemon juice to thin it out. Chill the sauce for 10 minutes before mixing—this firms up the mayo and sour cream naturally. Avoid adding milk, as it can make the sauce separate.
Can I add other vegetables to this salad?
Yes! Thinly sliced radishes, bell peppers, or celery work well for extra crunch and color. For a sweeter twist, add ½ cup diced apples or pears (tossed in lemon juice to prevent browning). Just keep portions balanced—no more than 25% of the total volume to maintain the signature crisp texture.
How long can I store the salad in the fridge?
The salad stays fresh for up to 2 days if stored in an airtight container. For best texture, keep the sauce and vegetables separate until ready to serve. The onions may soften slightly over time, so add them fresh if possible. The sauce alone keeps for 3 days in the fridge.