- 1/4 cup (packed) fresh mint leaves
- 1/4 cup sugar or agave syrup
- 5 cups peeled, seeded, coarsely chopped watermelon (from about a 2 1/2-pound watermelon)
- 1/4 cup fresh lime juice
- Mint sprigs (for serving)
- Combine mint leaves, sugar, and 1/4 cup water in a small pot. Bring to a boil and stir until sugar has dissolved. Transfer mixture to a heatproof container and chill, uncovered, until cool, about 30 minutes.
- Strain mint syrup into a blender; discard mint leaves. Add watermelon and lime juice and blend until very smooth. Using a fine-mesh sieve, strain into a pitcher; discard solids. Add 2 cups water and stir well to combine. Serve with mint sprigs.
- Aqua fresca can be stored in an airtight container and chilled for up to 1 day.