Place watermelon, agave nectar and Thai basil leaves in blender.

Blend until smooth.

Strain watermelon mixture through a fine mesh sieve to separate the watermelon juice from the pulp.

Add plenty of ice to a glass.

Add lime juice, watermelon/basil juice, and stir.

Garnish with lime wedges and Thai basil sprigs.

For margaritas salt the margarita glass rim, add tequila and stir. Then add a splash of Grand Marnier. Garnish and serve.