Coarse salt and Old Bay seasoning for rims, optional
4 ounces fresh watermelon juice
3 ounces tequila
1½ ounces orange liqueur
1 ounce freshly squeezed lime juice
Splash of agave nectar, optional, for a sweeter drink
Wet the rims of two rocks glasses with the spent lime and dip in a mixture of salt and Old Bay (to taste). Fill the glasses with ice.
Combine the watermelon juice, tequila, orange liqueur, lime juice, and agave nectar (if using) in a shaker. Add ice and shake until combined and well chilled. Strain into prepared glasses and garnish with a wedge of watermelon, if desired. Serve immediately.