You will need:

• 1 1/2 ounces blanco tequila
• 3/4-ounce Triple Sec or any orange liqueur
• 1 cup watermelon juice (use either juice extractor or blender if you remove the seeds)
• Watermelon balls, for garnish

In a martini shaker, add ice, tequila, Triple Sec and watermelon juice. Shake to combine and strain over a chilled martini glass. Garnish with watermelon balls.