Crisp cucumber and fresh lime define my keto cucumber lime margarita, with a sugar-free simple syrup that dissolves clean in a cold drink — 2g net carbs. I blend it in big batches because one glass is never enough.
I made my first cucumber lime margarita years ago after ordering one at a restaurant and thinking there's no way I can't make this work without sugar. Took me a few rounds to get the sweetener right (more on that below), but this version has been my go-to batch cocktail since 2019.
Most cucumber margarita recipes online are built for one drink in a shaker. Mine fills a blender. I use 8oz of tequila, a full cucumber, and enough ice to make it frozen, because I've never once made this for just myself. Friday nights, backyard hangs, someone's birthday on the patio. This is a crowd drink, and the blender does all the work.
The sweetener piece is the part I want you to get right. I tested both granulated and powdered erythritol in cold drinks, and granulated creates a cooling aftertaste that gets worse the colder the drink gets. Powdered erythritol dissolves completely into the simple syrup and you don't taste it at all. That one swap is the difference between "this tastes like a diet drink" and "wait, this is keto?"
The cucumber does most of the heavy lifting flavor-wise. I peel it first (the skin gets bitter when blended) and slice it thick so the blender catches everything. Fresh lime juice is non-negotiable. Bottled works in a pinch but the flavor is flatter. You'll taste the difference.
If you want a spicy version, slice 3-4 rounds of jalapeño and blend them right in. I remove the seeds first because the heat can bury the cucumber if you're not careful. A Tajín rim instead of plain salt is another easy upgrade that adds a little chile-lime bite without any extra carbs.
For anyone wondering about Triple Sec (the orange liqueur in a traditional margarita), skip it. Most brands run 10-11g carbs per ounce. I add a tiny splash of orange extract instead, maybe 1/4 teaspoon, and it gives you that same citrus layer without the sugar. The whole batch comes out to roughly 2g net carbs per serving, which is about as low carb as a cocktail gets.
One of my readers, Ray, told me he made this on a random Friday night in February trying to recreate a cucumber margarita from a bar he and his wife used to go to before keto. His words: "It tastes close, closer than I thought possible with the erythritol simple syrup instead of sugar." He made it twice that week. That's the kind of feedback that tells me the recipe actually works.
If you're into keto cocktails, I have a classic keto margarita that's more traditional, a keto mojito for mint lovers, and a keto piña colada if you want something tropical. My keto strawberry daiquiri is another blender drink that works the same way for batches.
The cucumber mellows out the tang from the limes in this pitcher sized batch.
The simple syrup is equal parts powdered erythritol and water, brought to a boil and then cooled.
For a margarita on the rocks, leave the ice out of the blender and pour the blended mix over ice.
For Halloween or Christmas, I dip the rim in sugar free vanilla syrup tinted with red food coloring so it drips down the glass.
To make sugar free simple syrup, add 1/3 cup water and powdered erythritol to a small saucepan. Stir to combine and heat until boiling. Remove from heat and let cool.
2
Add to blender
Add all ingredients to a blender, including the simple syrup, 1/2 cup water and enough ice to fill 3/4 of the blender or as desired.
3
Blend it
Blend until smooth. Pour and enjoy.
Nutrition
Per serving: 1/4 of recipe
Calories
77
Fat
0.1g
Protein
0.3g
Total carbs
2.3g
Net carbs
2g
Nutrition is an estimate calculated from the ingredients listed. Brands vary, so check labels if you track closely.
Frequently Asked Questions
Should I use powdered or granulated erythritol for this margarita?
I've tested both, and powdered is the only way to go for cold drinks. Granulated erythritol creates a cooling aftertaste that gets more noticeable the colder the drink is. Powdered dissolves completely into the simple syrup and you won't taste it at all. I learned this the hard way after making a batch with granulated that tasted like I'd added menthol.
What can I use instead of Triple Sec to keep this low carb?
I skip Triple Sec entirely because most brands have 10-11g carbs per ounce. Instead, I add about 1/4 teaspoon of orange extract to the blender. It gives you that same citrus background without any sugar. I've also tried a splash of sparkling orange water and it works, just adds a little fizz to the texture.
Can I make a spicy jalapeño version?
I do this all the time. I slice 3-4 rounds of fresh jalapeño and toss them right into the blender with everything else. I always remove the seeds first because the heat can completely overpower the cucumber if you leave them in. Start with 2 slices if you're not sure about your spice tolerance. The cucumber and lime balance the heat really well.
Tajín or salt rim, which is better?
I go back and forth honestly. Plain salt is classic and clean. But Tajín adds a chile-lime bite that pairs so well with the cucumber that I reach for it more often now. It has less than 1g carbs per 1/4 teaspoon, so it won't affect your macros. I run a lime wedge around the rim and dip it. Works great on my sugar free blue hawaiian too.
How long does the sugar-free simple syrup keep in the fridge?
I make a bigger batch of simple syrup and keep it in a mason jar in the fridge. It lasts about 2 weeks with no issues. I've pushed it to 3 weeks and it was still fine, but the texture starts to get a little thicker. Having it pre-made means I can throw this together in about 2 minutes flat.
Can I make this as a single serving instead of a full batch?
I've scaled this down plenty of times. For one drink, use 2oz tequila, juice from half a lime, about a third of a cucumber, a couple tablespoons of simple syrup, and a handful of ice. I still use the blender even for a single serving because that's what gives it the frozen texture. If you want something lighter, my keto lemonade is a good non-alcohol option.
Does this work without a blender?
You can muddle the cucumber and shake it with ice, but I'm going to be honest, it's a completely different drink. The blender is what gives this that smooth frozen texture. Muddling leaves cucumber chunks and you end up straining out most of the flavor. If you have any kind of blender, even a small one, use it. My cucumber smoothie uses the same blended approach.
Can I use English cucumber instead of regular?
I've used both. English cucumbers have thinner skin and fewer seeds, so they blend a little smoother. Regular cucumbers work just as well as long as you peel them first (I always peel either way because the skin gets bitter when blended). The flavor difference is minimal. I just grab whatever my grocery store has that week.
Similar recipes
People who cooked Refreshing Cucumber Lime Margarita also made
Syrup first, everything else later. Make a triple batch of the erythritol syrup on Sunday and it keeps the whole week in the fridge, so blending a pitcher on a weeknight takes about three minutes. Sweetness-wise I dialed it back to a quarter cup per pitcher instead of the full amount, that’s where it clicked for me, the original can run sweet depending on your erythritol brand. The cucumber-to-lime ratio as written is solid though, I spent a couple pitchers adjusting and kept coming back to what’s here. Four batches in now and my system is syrup on Sunday, cucumbers and limes prepped the night before, blend to order. One thing: this doesn’t hold blended overnight, texture separates by morning, so even with everything prepped, blend each round fresh.
I only have granulated erythritol, not the powdered kind. Will that work for the simple syrup, or do I need to track down powdered? My last couple sugar-free syrups came out grainy and I really don’t want that happening here.
Granulated won’t dissolve clean, and the cooling aftertaste gets noticeably worse the colder the drink is. That’s probably what made your other syrups grainy too. Worth tracking down the powdered kind, it blends completely and you won’t taste it at all.
Batch four this summer and I’ve started making a double every time because one pitcher disappears on a pool afternoon. The cucumber keeps it from tasting like just lime and tequila, which is what sets it apart from every other keto margarita I’ve tried.
Added fresh mint when blending. Completely changes it, brighter and more bar-adjacent than I expected. Also: freeze the cucumber slices first. Less ice, and the flavor stays concentrated instead of getting watered down.
Frozen cucumber instead of extra ice is genuinely smarter than what I’ve been doing. The mint I haven’t tried but bar-adjacent sold me, going in the next batch.
This is my third batch this summer and I can’t believe I was making one glass at a time before. The cucumber comes through so clean (I was worried it would taste too vegetal) and the lime keeps it bright the whole way through. Two minutes in the blender and it’s done. Already doubling the next one for our pool day this weekend.
Made a big batch of these for a porch evening last weekend. Lime and cucumber balance: spot on. The powdered erythritol syrup dissolved clean like she says, no graininess at all. One note: if you don’t have a high-powered blender, strain it before serving. Mine came out pulpy, and while the flavor held up, the texture got old by the second glass. Easy fix. Making these all summer.
The erythritol syrup actually dissolves clean, which I was not expecting (I’ve had so many gritty keto drinks), and the cucumber-to-lime balance is perfect. Only thing I’d change: rim the glass with salt instead of blending it in, because the saltiness gets uneven and fades by the second half of the drink. Still making another batch this weekend.
Made this four or five times. It’s my warm-weather go-to now. The powdered erythritol is what makes it work, no gritty texture or that weird cooling aftertaste some sweeteners leave. I blend a double batch and leave it in the fridge. Still good the next day over ice.
Threw in a few jalapeño slices before blending and I’m not going back to the original. The cucumber still does its cooling thing but now there’s this slow burn underneath that makes the whole drink way more interesting, like the two flavors are actually arguing with each other in the best way. One tip: skip the plain salt rim and do tajin instead, the chili-lime edge plays so well against the cucumber. Spring evenings just got sorted.
Tajín rim is the better call, I barely use plain salt anymore. Seeds out on the jalapeño though. Leave them in and the heat takes over, the cucumber just disappears.
I used to make cucumber margaritas every spring before keto and told myself it was fine to skip them. Made a batch of this last week and the first sip caught me off guard. Something about the way the blended cucumber comes through, I didn’t expect it to feel this much like what I remembered.
The blender is what does it. Muddling leaves chunks and the flavor stays separate. Once it’s all blended together you get that smooth cucumber pull through the whole drink. Glad it hit right.
Made a pitcher of these for a backyard evening last weekend and my wife, who shoots down every sugar-free drink I’ve made since I started keto, poured herself a second glass without saying a word. That’s basically a five-star review from her. The cucumber was what I was nervous about (I almost skipped it thinking it would taste like a salad), but it blends in and just makes the whole thing taste cleaner and more refreshing than I expected. I also noticed the syrup didn’t leave that grainy coating that’s ruined other sugar-free drinks I’ve tried. I think it’s the powdered erythritol over regular granules. Planning to make a double batch before it gets any warmer out.
The cucumber thing gets people every time. It just blends in and makes the whole drink taste cleaner. And you nailed the reason on the syrup – granulated erythritol never fully dissolves cold, that coating is unavoidable. Powdered only.
Added a jalapeño half (seeds out) and a handful of fresh mint, and the whole thing clicked. The heat wakes up the lime and the erythritol sweetness stops sitting so far forward. This is a better margarita than what I was ordering at my favorite Mexican place before going keto, which is not something I expected to type. Four stars for the original, but with jalapeño it’s a straight five.
I’ve made this probably six times since I found it, and every time I have the same problem: I double the batch thinking that’ll be enough and it still disappears in one sitting. The powdered erythritol in the simple syrup was the thing I was most skeptical about (I’ve had too many keto drinks with that gritty aftertaste), but it dissolves completely and you’d never know. The cucumber makes it feel genuinely refreshing, not just sweet, and the lime cuts through everything in a way that actual margaritas sometimes don’t even do. I made a pitcher last weekend when the weather finally started turning, sat outside with it, and it felt like a proper spring evening. It’s become my go-to whenever I want something that actually feels like a treat and not a compromise. Already thinking about tripling the batch next time and seeing if I can still fit it in my blender.
There was this place my wife and I used to go to, years before keto, that had a cucumber margarita I thought about more than I probably should have. Made this on a Friday night in February just to have something different, not expecting it to actually land. But the second that cucumber and lime hit the blender, I had to stop (smell does that). It tastes close too, closer than I thought possible with the erythritol simple syrup instead of sugar. I’ve had that sweetener get weird on me before but here it just works. Made it twice this week and I’m already thinking about July.
That smell thing is real. The erythritol took the most testing honestly. Granulated has a cooling aftertaste that gets worse cold, powdered doesn’t have that.
