Thirsty Thursday: Watermelon Grapefruit Mojito

I’ve been getting into the summer spirit on the blog this week with all things watermelon! On Tuesday I shared a delicious sugar cookie recipe, and yesterday I blogged about our watermelon porch makeover.

Get the recipe here, and see the porch makeover here.

Today I’m sharing a delicious recipe for a super summery cocktail: a watermelon grapefruit mojito. This cocktail was a happy accident because as I was juicing the watermelon, I realized it was not going to yield enough juice but I didn’t have time to go to the store. Luckily, I had some ruby red grapefruit juice in my fridge, and I thought the two would compliment each other nicely, so I went with it.

To prep for taking the cocktail to a party, here’s what I did…


First, I gathered the ingredients for the mint simple syrup:

  • 2 cups water
  • 2 cups granulated sugar
  • 2 handfuls of fresh mint, roughly 40 leaves

Next, I gathered the ingredients for the watermelon puree:

  • cups cubed seedless watermelon about 1/2 mini watermelon

Then, I gathered the rest of the ingredients for the mojito:

  • White rum
  • 1 and 1/3 cups lime juice
  • Club soda
  • Ice
  • Optional garnishes: watermelon, limes, mint

Once I was home, it was time to prep everything. First up was making the simple syrup. I did this by combining the water, sugar, and mint in a small saucepan. It was brought to a boil then boiled until the sugar was dissolved. Then I removed it from heat and chilled it. (I made way more of the syrup than I needed, so I could have it on hand for future cocktails.)

While the simple syrup chilled, I made the watermelon puree. I placed the watermelon cubes in a blender and processed until smooth. Then I poured through a sieve to remove any lumps. It was at this point I realized I needed a lot more juice – this process yielded about two cups worth. So, I added in the grapefruit juice to make the whole mixture four cups worth.

When it was time to head to the party, I put each of the ingredients into their own vessel and set it all out in a build-your-own style on the bar.


For one cocktail, here’s what I used:

  • 3/4 cup watermelon grapefruit juice
  • 1 oz or 2 oz rum (this depends on your preference)
  • 2 Tbsp. lime juice
  • 1 tsp. simple syrup

I put all the above into a cup, then added ice. Then, I topped the mixture with club soda, added the garnishes and a straw and served.

The cocktail was a big hit, and I know it’ll be on repeat this summer!

Party on!

One thought on “Thirsty Thursday: Watermelon Grapefruit Mojito

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