1 oz of Tequila
1/2 oz of Triple Sec
1 oz of blue curacao liqueur
1/2 oz of Midori melon liqueur (or watermelon liqueur)
Pour the blue curacao, tequila, Midori melon liqueur and triple sec into a cocktail shaker half-filled with ice cubes. Shake well, strain into a cocktail glass, and serve.