How to Make Rhubarb Simple Syrup for Mocktails and Cocktails

Learn how to make rhubarb simple syrup for the tastiest mocktails and cocktails this summer!

bottles of rhubarb simple syrup

Also read: How and When to Harvest Rhubarb, Unsweetened Rhubarb Juice, Herb Infused Simple Syrups

This recipe will make two cups or 500 ml of rhubarb simple syrup, enough for 8-10 cocktails or mocktails. The recipe can easily be doubled. Store it in the fridge for up to a week or in the freezer for months.

three kinds of rhubarb mocktails
Three tasty mocktails made with rhubarb simple syrup.

Rhubarb simple syrup is a great addition to the herb infused simple syrups I make over the summer.

variety of herb infused simple syrup on table
A variety of herb infused simple syrups for your summer beverages.

Recipe for Rhubarb Simple Syrup

bottles of rhubarb simple syrup
Print Recipe
5 from 3 votes

Rhubarb Simple Syrup

This rosy sweet rhubarb syrup is perfect for making refreshing mocktails and cocktails. It's easy to make with either fresh or frozen rhubarb. The level of sweetness in this recipe is not so much that you can't taste the flavor of rhubarb, but it's enough that you can easily use sparkling water or club soda instead of pop when mixing beverages. Of course, if you want it sweeter or less sweet - you can adjust accordingly.
Prep : 15 mins
Cook : 20 mins
Servings: 2 cups


  • 4 cups diced rhubarb fresh or frozen
  • 1 cup water
  • 1 cup granulated sugar


  • In large pot, bring rhubarb and 1 cup water to boil. Reduce heat and simmer for 10-15 minutes until rhubarb is soft and completely breaks apart.
  • Pour mixture through a fine mesh strainer. Use the back of a spoon to squeeze out any remaining liquid.
  • Measure strained juice and add enough water to equal 2 cups in total. If you use frozen rhubarb, you may not need to add extra water at all. If you have more than 2 cups liquid, add a little more sugar (ratio of 2 parts rhubarb juice to 1 part sugar).
  • Return to pot and stir in sugar. Heat and stir to dissolve sugar, no need to boil,
  • Remove from heat.
  • Let cool and pour in clean jar or bottle. Seal and store in fridge for 1-2 weeks or freeze for longer storage.


Bright Red: The color of rhubarb syrup is a salmon/rose/coral color - it is not bright pink or red. If you want a deeper red color you can add strawberries, raspberries or a little red food coloring before you add the sugar. 
How Many Stalks? You need about 8-10 medium sized stalks to get 4 cups.  That's about 1 1/3 pounds or 600 grams of rhubarb. But don't worry too much about exact measurements with this recipe, cook however much rhubarb you have, strain it and measure it. Add or subtract sugar accordingly - a little more or less is okay.
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Course: Drinks
Cuisine: American
Keyword: cocktails, mocktails, rhubarb

bottles of rhubarb simple syrup

How to Use Rhubarb Simple Syrup

Our favorite ways to use rhubarb simple syrup:

  • When we don’t want to be fancy, we mix 1 part syrup with 3 parts club soda over ice.
  • When we want to be fancy, but alcohol free, we make mocktails – see the three recipes below.
  • When we want to be fancy with alcohol, we make cocktails – see suggestions below.
  • When we don’t want a beverage, we use the syrup on top of ice cream or use it to sweeten oatmeal.
  • It’s great on top of Rhubarb Bread Pudding which soaks it all in.
ingredients for mocktails and cocktails
Ingredients for some tasty mocktails or cocktails.

Three Mocktails Using Rhubarb Simple Syrup

Instructions per glass.

For the teens and adults that tested these recipes, the syrup added enough sweetness that club soda or sparkling water worked perfectly. If you love a really sweet drink, you could use lemon/lime pop instead.

To make rhubarb curls, use a vegetable peeler to peel long thin strips along the flat side of a rhubarb stem. Twirl and garnish.

Teen tested and approved! My girl is happy to have fancy bevies to share with her friends.

Sparkling Rhubarb Pink Lemonade Mocktail

1/4 cup rhubarb simple syrup
1/4 cup pink lemonade
club soda or sparkling water

Fill a short glass (rock glass or highball glass) with ice.
Add 1/4 cup rhubarb simple syrup and 1/4 cup pink lemonade then top with sparkling water or club soda.
Garnish with rhubarb ribbons and enjoy!
sparkly rhubarb pink lemonade

Rhubarb Pink Lemonade Cocktail: Add a shot of vodka and a shot of Malibu for extra flavor and summer flare.

Rhubarb Mojito Mocktail

5-8 mint leaves
1/4 cup rhubarb simple syrup
1 Tbsp lime juice
club soda or sparkling water

Place fresh mint in the bottom of a short tumbler. Muddle in the glass with the back of a spoon just to release flavors, be careful not to shred into tiny pieces.
Top with ice.
Pour in rhubarb simple syrup and lime juice.
Top with club soda or sparkling water.
Garnish with sprig of mint or slice of lime.

rhubarb mojito outside
Rhubarb Mojito Mocktail with mojito mint.

Rhubarb Mojito Cocktail: Add a shot of white rum. For added depth, add half a shot of Cointreau too.

Video Bonus: How to Harvest Mojito Mint for Cocktails & Mocktails

Rosemary Rhubarb Smash Mocktail

1 rosemary sprig, stripped
1/4 cup rhubarb simple syrup
1 Tbsp fresh lemon juice
club soda or sparkling water

Gently muddle rosemary leaves, and rhubarb syrup in the bottom of a cocktail shaker.
Add lemon juice and ice. Cover and shake vigorously for 10 seconds.
Strain into a short tumbler of fresh ice.
Top with sparkling water and stir to incorporate.

rhubarb rosemary smash
This rhubarb rosemary smash is perfect when you want something tasty and unique but alcohol free.

Rosemary Rhubarb Smash Cocktail – Add a shot of gin or vodka. Or try something deeper like bourbon.

More Cocktail Ideas?

How to Make Herb Infused Simple Syrups for Cocktails & Mocktails

Here’s another mocktail featuring rhubarb syrup, pineapple juice and sparkling water. Don’t you just love the layers?! The heavy rhubarb syrup settles on the bottom giving a sunset effect.

rhubarb syrup drink
I call this prairie sunset. Rhubarb simple syrup, pineapple juice and sparkling water. Beautiful and delicious. Try other herb infused syrups too.

Check out the rhubarb cookbook for Rhubarbarita and Rhutini. Yup, I used rhubarb juice to make a rhubarb margarita and a rhubarb martini.

Click here for a mimosa featuring rhubarb juice, orange juice and sparkling wine like Prosecco or Cava.

three kinds of rhubarb mocktails
Which one will you try first?
Are you ready to enjoy some rhubarb mocktails or cocktails this summer? Which one will you try first? Comment below or if you make one of these recipes, share your photos with me on Instagram @getgettys or Facebook @GettyStewart.HomeEconomist.
Interested in 45 other rhubarb recipes all in one easy reference by your favorite Home Economist (um, that would be me!). Check out my rhubarb ebook!
Getty Stewart is a Professional Home Economist,  speaker, frequent media guest and writer dedicated to putting good food on tables and agendas.  She is the author of several recipe books on enjoying and preserving fruit, Founder of Fruit Share, a mom and veggie gardener.Sign up to get articles by Getty delivered to your inbox. You’ll get recipes, practical tips and great food information like this.

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