Prepare the Watermelon: In a blender, combine fresh watermelon cubes and blend until smooth. If you prefer a smoother drink, strain the puree through a fine mesh sieve to remove the pulp.

Mix the Drink: In a cocktail shaker, add the watermelon juice, vodka, lemon juice, and simple syrup. Fill the shaker with ice and shake vigorously for 10–15 seconds.

Serve: Fill glasses with ice and strain the mixture into the glasses.

Top with Water: Add cold water or sparkling water for a fizzy touch and stir gently.

Garnish and Enjoy: Garnish with lemon slices and fresh mint. Serve chilled!