This Watermelon Mojito stays smooth and refreshing from the first sip to the last. By pairing fresh watermelon juice with a mint-infused simple syrup, you get big summer flavor without the pulpy mess or faded taste at the bottom of the pitcher.
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What Makes This Different
Muddling fruit and herbs one glass at a time is fine for one, but it is slow business for a crowd. Plus no one likes picking watermelon pulp out of their teeth. Blending and straining the fruit into smooth juice fixes the drink texture, while a quick mint simple syrup keeps the flavor consistent without the bitterness that comes from over-muddling mint leaves in a pitcher.
It's my favorite party trick: both the juice and syrup can be made days ahead, so when guests arrive, you just stir and pour instead of playing bartender all night.
(Flying solo? The recipe card below has measurements for a single cocktail, too.)
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Ingredients and Substitutions
This one comes together in two parts, both made ahead. The pitcher of mojitos takes only minutes to make once guests arrive.
- Watermelon juice. Puree fresh watermelon cubes in a blender and strain out the pulp. That's what gives you real watermelon flavor in every single glass instead of just the ones lucky enough to catch a chunk.
- Mint simple syrup. This is also homemade but couldn't be easier. Simmer sugar and water together, then steep mint sprigs in it before straining and letting it cool. Steeping the mint this way means every glass gets the same clean mint flavor, without the bitter edge you get from relying on muddled leaves alone in a big batch.
- Fresh mint leaves. Still muddled gently into the pitcher with the lime juice and syrup. The syrup does the heavy lifting on flavor, but fresh leaves add the aroma and brightness that syrup alone can't.
- Lime juice. Only fresh here, always. Bottled lime juice is convenient, but the preservatives in it flatten the flavor, and you'll taste the difference in a drink this bright.
- White rum. A classic mojito always calls for white rum, and I stick with tradition here so the mint, lime, and watermelon stay front and center instead of getting muddied by spice notes.
- Club soda. Added per glass at serving, never batched into the pitcher. Batch it early and by the time you pour glass six, it's flat.
How to make Watermelon Mojitos for a Crowd
Puree watermelon and strain it into juice.
Simmer sugar and water, then steep mint in it to make syrup.
Muddle mint leaves with the lime juice and mint syrup in a pitcher.
Stir in the watermelon juice and rum. Chill until ready to serve. Pour over ice and top each glass with club soda.
Before You Make This
- Strain the watermelon juice. Skip this and you'll end up with pulp clouding the pitcher and clogging every straw at the party. A fine mesh strainer is worth the extra step and keeps every pour clean.
- Chill the watermelon juice and syrup before combining them. This matters most for the syrup, since it comes straight off the stove. Warm and room temperature ingredients melt the ice in the pitcher fast, and a watered-down mojito before anyone's even had a glass isn't the goal.
- Muddle the mint gently, three or four presses is enough. Smash it harder than that, and the leaves tear and release bitter flavor.
- Add club soda per glass, not to the pitcher. Batch it into the pitcher ahead of time and you'll have flat mojitos by the time your guests arrive. Add it glass by glass instead.
FAQs
Yes. Look for a cold-pressed watermelon juice, just watermelon and maybe a smidge of lemon or lime juice added, nothing else. I'd skip anything labeled a watermelon juice "cocktail" or blend, since those usually combine several fruit juices and give you a different flavor than straight watermelon.
Make Ahead and Storage
The mint simple syrup keeps well in the fridge for up to 2 weeks, so it's one less thing to think about on the day you're actually serving these.
Watermelon juice holds for up to 4 days in the fridge, so that's another piece you can knock out early.
Once everything but the club soda is combined in the pitcher, plan to serve within 4 hours for the freshest flavor.
More Mojito Recipes
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Recipe
Watermelon Mojitos
Ingredients
Watermelon juice:
- 5½ cups watermelon cubes
Mint simple syrup:
- ½ cup granulated sugar
- ½ cup water
- 4 fresh mint sprigs
Pitcher (serves 8):
- 1 cup freshly squeezed lime juice
- ¾ cup mint simple syrup
- 24 fresh mint leaves
- 3 cups watermelon juice
- 2 cups white rum
- 2 cups club soda
Single serving (shaken):
- 1 ounce freshly squeezed lime juice
- ¾ ounce mint simple syrup
- 3 fresh mint leaves
- 3 ounces watermelon juice
- 2 ounces white rum
- 2 ounces club soda
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Instructions
To make the watermelon juice:
- Puree watermelon cubes in a blender until smooth. Strain through a fine mesh strainer. Refrigerate until ready to use.5½ cups watermelon cubes
To make the mint simple syrup:
- Bring sugar and water to a boil in a small saucepan, stirring until the sugar dissolves. Remove from heat, stir in the mint sprigs and let infuse for 30 minutes. Strain, then cool completely.½ cup granulated sugar, ½ cup water, 4 fresh mint sprigs
To make a pitcher:
- In a large pitcher, gently muddle the mint leaves with the lime juice and mint syrup, about 3-4 presses.1 cup freshly squeezed lime juice, ¾ cup mint simple syrup, 24 fresh mint leaves
- Stir in the watermelon juice and rum until combined. Refrigerate until ready to serve.3 cups watermelon juice, 2 cups white rum
- To serve, fill glasses with ice, evenly divide the mojito mixture among the glasses and top each glass with about 2 ounces of club soda. Stir gently. Garnish with additional mint, watermelon or lime slices, if desired.2 cups club soda
To make a single mojito:
- Place the lime juice, mint simple syrup and mint leaves in a cocktail shaker. Muddle gently 3-4 times.1 ounce freshly squeezed lime juice, ¾ ounce mint simple syrup, 3 fresh mint leaves
- Fill the shaker with ice then add the watermelon juice and rum. Add the lid and shake for 30 seconds.3 ounces watermelon juice, 2 ounces white rum
- Pour into an ice-filled glass, top with club soda and stir gently. Garnish with additional mint, watermelon or lime slices, if desired.2 ounces club soda
Notes
- This recipe was updated from the original muddled, single-serve glass version. See the post above for what changed.
- Mint simple syrup keeps in the refrigerator for up to 2 weeks.
- Watermelon juice keeps in the refrigerator for up to 4 days.
- Once the pitcher batch is combined (everything except club soda), it holds in the refrigerator for up to 4 hours before serving.
- Add club soda per glass at serving so it never goes flat.
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Nutrition
Nutrition info not guaranteed to be accurate.
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