2 oz of Vodka
1 oz of Midori melon liqueur (or watermelon liqueur)
1/2 oz of chilled sprite soda (or Sprite)
Pour the vodka and Midori melon liqueur into a cocktail shaker half-filled with ice cubes. Shake well, and strain into a highball glass filled with ice cubes. Top with chilled Sprite, stir gently and serve.