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Watermelon Slushie Mocktail

5 from 3 votes
Glasses of frozen watermelon slushies with lime wedges.
This watermelon slushie mocktail is the best way to cool down on a hot summer day. This icy treat is made with just 3 simple ingredients and works with any type of frozen melon.
Prep Time 10 minutes
Freezing Time 4 hours
Total Time 4 hours 10 minutes
Serving Size 2

Ingredients
 

  • 4 cups watermelon cubes
  • 3 tablespoons fresh lime juice
  • 2-3 tablespoons simple syrup see notes
  • 4 ounces cold water ½ cup
  • pinch of salt

For Serving (Optional)

  • flaky salt or sugar for rim
  • lime wedges

Instructions

  • Using a sharp knife, cut the watermelon into cubes and discard the rind. Arrange the cubed watermelon in a single layer on a lined baking sheet and freeze for about 3-4 hours or until completely frozen.
  • Make the simple syrup around the same time you freeze the watermelon so that it's nice and cold when you're ready to make the slushie drink.
  • Add the frozen watermelon cubes, fresh lime juice, water, simple syrup, and a pinch of salt to a blender. Blend until smooth (you may need to stop and scrape down the sides or use a tamper if your blender has one).
  • Serve in a chilled glass with a salted or sugared rim (optional).

Notes

Although watermelon is already sweet, a small amount of simple syrup (or any sweetener) helps intensify the flavor of the watermelon. How much you add will depend on how sweet your fruit is and your personal preference, so adjust accordingly.
Make It Your Way: Substitutions & Variations
No fresh lime juice? - use lemon juice.
No simple syrup? - depending on the sweetness of your watermelon you may not need it. If you do, you can also use maple syrup.
Instead of water - use coconut water.
Add-ins - fresh mint or fresh basil.
Variations - try other kinds of ripe melon and get creative with infused simple syrups to create endless variations.