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    Home » Keto Cocktails and Beverages » Rhubarb Fizz Cocktail – Sugar Free!

    Published: May 4, 2021 by Carolyn

    Rhubarb Fizz Cocktail – Sugar Free!

    This post may contain Amazon or other affiliate links. As an Amazon Associate I earn from qualifying purchases.

    586 shares
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    This rhubarb cocktail is a delightfully refreshing spring beverage. With a beautiful pink color and that unique rhubarb flavor, it’s the perfect sugar-free cocktail for Mother’s Day!

    Titled image of a sugar free rhubarb cocktail in a champagne flute with a strip of peeled rhubarb as garnish.

    I’ve made no secret about my love of all things rhubarb, and how much I love to work it into keto dessert recipes. And now I offer you this sparkling sugar free cocktail as yet another wonderful way to enjoy that stalky low carb vegetable.

    Rhubarb is only available in the spring, so for me it just screams Mother’s Day. Since it isn’t something you can find year round, it lends a festive touch to any recipe. And what’s more festive than a sparkly, sweet pink cocktail?

    I’m calling it a rhubarb fizz, but it could honestly be considered a rhubarb mimosa too. It’s perfect for Sunday brunch or as a tasty pre-dinner cocktail.

    A champagne flute filled to the brim with sugar-free rhubarb fizz cocktail in a dark background.

    Sugar Free Simple Syrup

    Simple syrup is a common ingredient in many cocktails. And for years, I despaired of having a good keto-friendly version. Because if you understand the properties various keto sweeteners, then you know that erythritol does not make very good simple syrup.

    But new sweeteners like allulose have come along and changed the game entirely. Allulose is what they call a “rare sugar”. It actually IS, in fact, a sugar, but it does not affect blood glucose at all – and may even lower it. So in that regard, it does not behave like regular table sugar.

    However, it does behave like sugar when simmered with water, so you can make syrup with it. I have a delicious and easy keto chocolate syrup that uses allulose.

    I decided to make a rhubarb simple syrup for this sugar-free cocktail, so I simply simmered rhubarb with water and a combination of Swerve and allulose. You could simply use allulose for this if you prefer.

    A sugar free rhubarb cocktail in a champagne flute sits beside a bottle of champagne with sliced rhubarb all around the bottom.

    How to make a Rhubarb Fizz Cocktail

    This fun sugar free cocktail was inspired by one I spotted on Saveur.com. It’s super easy to make and the rhubarb syrup is useful for other recipes too. Try it over ice cream!

    Rhubarb Simple Syrup

    You will need about 4 stalks of rhubarb for this recipe. Chop it into slices about ¼ to ½ inch thick. They do not need to be even and perfect.

    Simply bring the rhubarb, water, and sweeteners to a boil. Reduce the heat to a simmer and cook until the rhubarb is super soft. Then strain the mixture through a sieve to remove the solids.

    If you’re a rhubarb lover, don’t throw those solids away! They are tasty and delicious in yogurt, over ice cream, or just eaten with a spoon.

    Let the rhubarb syrup cool before adding it to a cocktail. Store it in the refrigerator in a glass bottle or jar. It makes about 6 ounces (enough for 6 cocktails) and should last up to two weeks.

    Rhubarb Fizz Cocktail

    Once you have the syrup, you can make these sugar free cocktails any time. You can make one or a bunch, as you please.

    Add about 1 ounce (2 tablespoons) to the bottom of a champagne flute. Stir in ½ ounce (1 tablespoon) vodka or gin, and then top up with champagne or Prosecco.

    Close up shot of the top of a champagne flute filled with rhubarb fizz cocktail.

    Can you make a Virgin Rhubarb Cocktail?

    Absolutely! I recommend using a bit more of the rhubarb syrup (1 ½ to 2 ounces) and topping up with seltzer or soda water.

    You may find you want to sweeten it a bit more, simply because soda adds no sweetness. Stir in a teaspoon or so of powdered Swerve into your mocktail to make up the difference.

    More Keto Mother’s Day Brunch Ideas

    • Bakery Style Keto Coffee Cake
    • Asparagus Eggs Benedict
    • Keto Bagels
    • Keto Almond Croissants
    • Low Carb Corned Beef Hash
    • Keto Lemon Poppyseed Cake
    Close up shot of the top of a champagne flute filled with rhubarb fizz cocktail.

    Rhubarb Fizz Cocktail

    This rhubarb cocktail is a delightfully refreshing spring beverage. With a beautiful pink color and that unique rhubarb flavor, it's the perfect sugar-free cocktail for Mother's Day!
    5 from 5 votes
    Print Pin Rate
    Course: Drinks
    Cuisine: Beverage
    Keyword: rhubarb cocktails, sugar free cocktails
    Prep Time: 10 minutes
    Cook Time: 10 minutes
    Total Time: 20 minutes
    Servings: 1 cocktail
    Calories: 118kcal

    Ingredients

    Rhubarb Syrup

    • 3 cups chopped rhubarb
    • 1 ½ cup water
    • ¼ cup powdered Swerve Sweetener
    • ¼ cup allulose

    Rhubarb Fizz Cocktail

    • 1 ounce rhubarb syrup
    • ½ ounce vodka (or gin)
    • 3 ounces sparkling white wine

    Instructions

    Rhubarb Syrup

    • In a medium saucepan over medium heat, combine the rhurbarb, water, Swerve, and allulose. Bring to a boil, then reduce the heat to a simmer. Cook until the rhubarb is very soft, about 10 minutes.
    • Strain the mixture through a sieve into a bowl, pressing on the solids to release as much liquid as possible. Discard the solids (or serve over ice cream, it's delicious!).

    Rhubarb Fizz Cocktail

    • Pour 1 ounce of rhubarb syrup into a champagne flute. Add the vodka and stir to combine. Top up with the sparkling wine.
    • Use a carrot peeler to peel a thin slice of rhubarb for garnish.
    Nutrition Facts
    Rhubarb Fizz Cocktail
    Amount Per Serving (1 cocktail)
    Calories 118
    % Daily Value*
    Carbohydrates 3.6g1%
    Protein 0.4g1%
    * Percent Daily Values are based on a 2000 calorie diet.
    586 shares

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    Nutritional Disclaimer

    Please note that I am not a medical or nutritional professional. I am simply recounting and sharing my own experiences on this blog. Nothing I express here should be taken as medical advice and you should consult with your doctor before starting any diet or exercise program. I provide nutritional information for my recipes simply as a courtesy to my readers. It is calculated using MacGourmet software and I remove erythritol from the final carb count and net carb count, as it does not affect my own blood glucose levels. I do my best to be as accurate as possible but you should independently calculate nutritional information on your own before relying on them. I expressly disclaim any and all liability of any kind with respect to any act or omission wholly or in part in reliance on anything contained in this website.

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      Recipe Rating




    1. vicki k says

      June 08, 2022 at 10:07 am

      the leftover Rhubarb is great in baked goods. I just made your Bakery Style Muffins with “used” rhubarb and they were great. They still have a lot of flavor and since the Rhubarb is relatively dry, the moist/dry balance is maintained in the muffins. I wouldn’t use “used” rhubarb in a crisp or other baked good where you want the juice.

      Reply
      • Carolyn says

        June 08, 2022 at 3:49 pm

        I just eat it with a spoon!

        Reply
    2. Susan says

      April 25, 2022 at 7:28 pm

      Love the sound of this fizz but I live in Australia and we can’t get those sweeteners here. I mostly use an Erythritol and monk fruit blend (Lakanto) and can get straight Erythritol or Xylitol so wonder which you would suggest and would the quantity be the same? Thanks so much for your wonderful recipes.

      Reply
      • Carolyn says

        April 26, 2022 at 6:57 am

        Lakanto is close to Swerve, so that’s fine. I would use xylitol in place of the allulose.

        Reply
        • Susan says

          April 28, 2022 at 4:35 am

          Thanks, much appreciated.

          Reply
    3. Angie says

      April 21, 2022 at 11:25 pm

      I’m so excited to try this! Is it correct to assume that if I skip the sparkling wine and just mix with the rhubarb syrup, vodka and seltzer, the carb count would be lower, correct?

      Reply
      • Carolyn says

        April 22, 2022 at 7:38 am

        I guess… you’d have to look that up, I think.

        Reply
    4. Sara Welch says

      June 17, 2021 at 6:52 pm

      5 stars
      Love a sweet cocktail with a kick and this was no exception! Currently enjoying my second round; delish!

      Reply
    5. Betsy says

      June 17, 2021 at 1:53 pm

      5 stars
      Yum! I love this low sugar recipe for a fun and delicious cocktail! Great drink for a celebration or even just because!

      Reply
    6. Lisalia says

      June 17, 2021 at 1:44 pm

      5 stars
      This was an absolutely indulgent and healthy grown up treat. I’m also excited to use your rhubarb simple syrup in so many other recipes. Genius!

      Reply
    7. Linda Reilly says

      May 05, 2021 at 1:19 pm

      HI Carolyn,

      This looks YUM! I love rhubarb, too. I read the whole entry and saw that you mentioned users can use just allulose, but I’m just curious why you used swerve AND allulose? Is that just to round out the sweetener profile? Thanks a million for all of your awesome recipes.

      Best,
      Linda

      Reply
      • Carolyn says

        May 05, 2021 at 9:02 pm

        Because I have had some tummy troubles when I use too much allulose. So for me, this half and half version is safer…

        Reply
    8. Liz says

      May 04, 2021 at 2:58 pm

      5 stars
      What a beauty!! This cocktail is perfect for my spring book club meeting next week!!!

      Reply
    9. Amanda says

      May 04, 2021 at 2:22 pm

      5 stars
      Absolutely a one of a kind type of recipe!

      Reply
    10. Jody says

      May 04, 2021 at 8:50 am

      I always have bochasweet on hand but have never purchased allulose. Can I substitute the two?

      Reply
      • Carolyn says

        May 04, 2021 at 9:56 am

        Yes, that should work here.

        Reply
    11. Nicole says

      May 04, 2021 at 8:34 am

      This looks delicious! Do you think I could use Bocha Sweet instead?

      Reply
      • Carolyn says

        May 04, 2021 at 9:56 am

        Yes, it should be fine.

        Reply

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