Cut watermelon into 1 inch pieces, then puree in a blender with lime juice and simple syrup.

To make simple syrup: boil water and mix about 1/2 cup water with 1/2 cup sugar, stirring until sugar is dissolved.

Strain watermelon mixture through a fine mesh strainer, straining once or twice as necessary into a large pitcher. Add club soda.

Meanwhile, blend alcohol with 10 mint leaves, pulsing once or twice to slightly tear the fresh herbs. Pour mixture into pitcher.

Add the rest of the mint leaves and sliced limes into the pitcher. Serve over ice in mason jar glasses and enjoy!