Ingredients

• 2 cups diced fresh watermelon
• 1/2 cup simple syrup
• Juice of 1 lime
• Two 8-ounce cans diet grapefruit soda, such as Fresca

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Instructions

1. Place the watermelon, simple syrup and lime juice in a blender. Puree until smooth. Pour into a small pitcher with ice. Add the diet grapefruit soda and stir. Pour into glasses.