Nothing says summer quite like the fresh flavors of watermelon, lemon, and crisp, cool mint.
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Working in batches if necessary, purée the watermelon in a blender or food processor and press the purée through a strainer. You’ll need about 4 cups of juice—it’s fine if there’s some pulp in the juice. Chill.
Put the lemon juice, simple syrup, and mint in a 3-quart serving pitcher or a punch bowl and mash the mint thoroughly with a muddler or the back of a wooden spoon. Add about 4 cups of ice, the gin, and the watermelon juice and stir.
Serve in rocks glasses over ice. Garnish with mint sprigs.
Photo: Scott Phillips