2 teaspoon Sugar
2 tablespoons Sugar
1/2 cup Tequila
1/4 cup Orange Liqueur such as Grand Marnier or Triple Sec
2 cups Ice Cubes
Place 2 teaspoons sugar in a small dish.
Rub rim of margarita glasses with 1 cut half of lime, and then roll glasses in sugar to coat.
Combine juice of limes, watermelon, 2 tablespoons sugar, tequila and orange-flavored liqueur with ice in a blender and process until smooth.
Fill blender with ice cubes and process until mixture is a slush consistency.
Fill prepared glasses with margaritas; garnish each glass with a lime wedge and watermelon balls on a skewer and serve immediately.